lock_daemon.c 41.1 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"
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#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"
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#include "virstring.h"
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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;
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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
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)
480
                    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);
498
                    goto error;
499 500 501 502 503
                }
                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;

518
 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;
559 560 561
    return 0;
}

562

563
static int
564 565 566 567 568
virLockDaemonSetupNetworkingSystemD(virNetServerPtr srv)
{
    virNetServerServicePtr svc;
    unsigned int nfds;

569
    if ((nfds = virGetListenFDs()) == 0)
570
        return 0;
571 572 573
    if (nfds > 1)
        VIR_DEBUG("Too many (%d) file descriptors from systemd", nfds);
    nfds = 1;
574 575 576

    /* Systemd passes FDs, starting immediately after stderr,
     * so the first FD we'll get is '3'. */
577
    if (!(svc = virNetServerServiceNewFD(3, 0,
578
#if WITH_GNUTLS
579 580
                                         NULL,
#endif
581
                                         false, 0, 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)
594 595 596 597 598
{
    virNetServerServicePtr svc;

    VIR_DEBUG("Setting up networking natively");

599
    if (!(svc = virNetServerServiceNewUNIX(sock_path, 0700, 0, 0,
600
#if WITH_GNUTLS
601 602
                                           NULL,
#endif
M
Michal Privoznik 已提交
603
                                           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;

646
    VIR_DEBUG("priv=%p client=%lld owner=%lld",
647
              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) {
673
            for (i = 0; i < 15; i++) {
674 675 676 677 678 679 680
                int signum;
                if (i == 0)
                    signum = SIGTERM;
                else if (i == 8)
                    signum = SIGKILL;
                else
                    signum = 0;
J
Jim Fehlig 已提交
681
                if (priv->clientPid != 0 && virProcessKill(priv->clientPid, signum) < 0) {
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                    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;
705
    unsigned long long timestamp;
706 707
    bool privileged = opaque != NULL;

708
    if (VIR_ALLOC(priv) < 0)
709 710 711 712
        return NULL;

    if (virMutexInit(&priv->lock) < 0) {
        VIR_FREE(priv);
713
        virReportSystemError(errno, "%s", _("unable to init mutex"));
714 715 716 717 718 719
        return NULL;
    }

    if (virNetServerClientGetUNIXIdentity(client,
                                          &clientuid,
                                          &clientgid,
720 721
                                          &priv->clientPid,
                                          &timestamp) < 0)
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        goto error;

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

    if (!privileged) {
        if (geteuid() != clientuid) {
730 731 732
            virReportRestrictedError(_("Disallowing client %llu with uid %llu"),
                                     (unsigned long long)priv->clientPid,
                                     (unsigned long long)clientuid);
733 734 735 736
            goto error;
        }
    } else {
        if (clientuid != 0) {
737 738 739
            virReportRestrictedError(_("Disallowing client %llu with uid %llu"),
                                     (unsigned long long)priv->clientPid,
                                     (unsigned long long)clientuid);
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            goto error;
        }
    }

    return priv;

746
 error:
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    virMutexDestroy(&priv->lock);
    VIR_FREE(priv);
    return NULL;
}


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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;
    }
787
    if (VIR_STRDUP(priv->ownerName, ownerName) < 0)
788 789 790 791 792 793 794 795 796 797 798 799 800
        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;

801
 error:
802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846
    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;

847
 error:
848 849 850 851 852
    virJSONValueFree(object);
    return NULL;
}


853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884
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;

885
 error:
886 887 888
    return -1;
}

889 890 891 892 893 894

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

895
    ignore_value(virAsprintf(&ret, "%lld", (long long int)getpid()));
896 897 898 899 900
    return ret;
}


static int
901 902 903 904
virLockDaemonPostExecRestart(const char *state_file,
                             const char *pid_file,
                             int *pid_file_fd,
                             bool privileged)
905 906 907 908 909 910 911 912 913
{
    const char *gotmagic;
    char *wantmagic = NULL;
    int ret = -1;
    char *state = NULL;
    virJSONValuePtr object = NULL;

    VIR_DEBUG("Running post-restart exec");

914 915 916
    if (!virFileExists(state_file)) {
        VIR_DEBUG("No restart state file %s present",
                  state_file);
917 918 919 920
        ret = 0;
        goto cleanup;
    }

921
    if (virFileReadAll(state_file,
922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947
                       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;
    }

948 949
    /* Re-claim PID file now as we will not be daemonizing */
    if (pid_file &&
950
        (*pid_file_fd = virPidFileAcquirePath(pid_file, false, getpid())) < 0)
951 952
        goto cleanup;

953 954 955 956 957
    if (!(lockDaemon = virLockDaemonNewPostExecRestart(object, privileged)))
        goto cleanup;

    ret = 1;

958
 cleanup:
959
    unlink(state_file);
960 961 962 963 964 965 966 967
    VIR_FREE(wantmagic);
    VIR_FREE(state);
    virJSONValueFree(object);
    return ret;
}


static int
968 969
virLockDaemonPreExecRestart(const char *state_file,
                            virNetServerPtr srv,
970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
                            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);

1037
    if (virFileWriteStr(state_file,
1038 1039 1040
                        state, 0700) < 0) {
        virReportSystemError(errno,
                             _("Unable to save state file %s"),
1041
                             state_file);
1042 1043 1044
        goto cleanup;
    }

1045
    if (execvp(argv[0], argv) < 0) {
1046 1047 1048 1049 1050 1051 1052
        virReportSystemError(errno, "%s",
                             _("Unable to restart self"));
        goto cleanup;
    }

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

1053
 cleanup:
1054 1055 1056 1057 1058 1059 1060
    VIR_FREE(pairs);
    VIR_FREE(state);
    virJSONValueFree(object);
    return ret;
}


1061 1062 1063 1064 1065 1066 1067 1068 1069
static void
virLockDaemonUsage(const char *argv0, bool privileged)
{
    fprintf(stderr,
            _("\n"
              "Usage:\n"
              "  %s [options]\n"
              "\n"
              "Options:\n"
1070
              "  -h | --help            Display program help:\n"
1071 1072
              "  -v | --verbose         Verbose messages.\n"
              "  -d | --daemon          Run as a daemon & write PID file.\n"
1073
              "  -t | --timeout <secs>  Exit after timeout period.\n"
1074
              "  -f | --config <file>   Configuration file.\n"
1075
              "  -V | --version         Display version information.\n"
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 1110 1111 1112 1113 1114
              "  -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"));
    }
}

int main(int argc, char **argv) {
1115
    virNetServerProgramPtr lockProgram = NULL;
1116 1117 1118 1119 1120 1121 1122 1123 1124
    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;
1125
    int timeout = -1;        /* -t: Shutdown timeout */
1126
    char *state_file = NULL;
1127 1128 1129 1130
    bool implicit_conf = false;
    mode_t old_umask;
    bool privileged = false;
    virLockDaemonConfigPtr config = NULL;
1131
    int rv;
1132 1133

    struct option opts[] = {
1134 1135
        { "verbose", no_argument, &verbose, 'v'},
        { "daemon", no_argument, &godaemon, 'd'},
1136
        { "config", required_argument, NULL, 'f'},
1137
        { "timeout", required_argument, NULL, 't'},
1138
        { "pid-file", required_argument, NULL, 'p'},
1139 1140
        { "version", no_argument, NULL, 'V' },
        { "help", no_argument, NULL, 'h' },
1141 1142 1143
        {0, 0, 0, 0}
    };

1144
    privileged = geteuid() == 0;
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157

    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;
1158
        char *tmp;
1159

1160
        c = getopt_long(argc, argv, "ldf:p:t:vVh", opts, &optidx);
1161

1162
        if (c == -1)
1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175
            break;

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

1176 1177 1178 1179 1180 1181 1182 1183 1184 1185
        case 't':
            if (virStrToLong_i(optarg, &tmp, 10, &timeout) != 0
                || timeout <= 0
                /* Ensure that we can multiply by 1000 without overflowing.  */
                || timeout > INT_MAX / 1000) {
                VIR_ERROR(_("Invalid value for timeout"));
                exit(EXIT_FAILURE);
            }
            break;

1186 1187
        case 'p':
            VIR_FREE(pid_file);
1188 1189
            if (VIR_STRDUP_QUIET(pid_file, optarg) < 0)
                goto no_memory;
1190 1191 1192 1193
            break;

        case 'f':
            VIR_FREE(remote_config_file);
1194 1195
            if (VIR_STRDUP_QUIET(remote_config_file, optarg) < 0)
                goto no_memory;
1196 1197
            break;

1198
        case 'V':
1199
            virLockDaemonVersion(argv[0]);
1200
            exit(EXIT_SUCCESS);
1201

1202
        case 'h':
1203
            virLockDaemonUsage(argv[0], privileged);
1204
            exit(EXIT_SUCCESS);
1205

1206
        case '?':
1207
        default:
1208
            virLockDaemonUsage(argv[0], privileged);
1209 1210 1211 1212
            exit(EXIT_FAILURE);
        }
    }

1213 1214
    virFileActivateDirOverride(argv[0]);

1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247
    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 &&
1248 1249 1250 1251
        virPidFileConstructPath(privileged,
                                LOCALSTATEDIR,
                                "virtlockd",
                                &pid_file) < 0) {
1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264
        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);

1265 1266 1267 1268
    if (virLockDaemonExecRestartStatePath(privileged,
                                          &state_file) < 0) {
        VIR_ERROR(_("Can't determine restart state file path"));
        exit(EXIT_FAILURE);
1269
    }
1270 1271
    VIR_DEBUG("Decided on restart state file path '%s'",
              state_file);
1272 1273 1274

    /* Ensure the rundir exists (on tmpfs on some systems) */
    if (privileged) {
1275 1276
        if (VIR_STRDUP_QUIET(run_dir, LOCALSTATEDIR "/run/libvirt") < 0)
            goto no_memory;
1277
    } else {
1278
        if (!(run_dir = virGetUserRuntimeDirectory())) {
1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297
            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);

1298 1299 1300 1301
    if ((rv = virLockDaemonPostExecRestart(state_file,
                                           pid_file,
                                           &pid_file_fd,
                                           privileged)) < 0) {
1302 1303 1304 1305
        ret = VIR_LOCK_DAEMON_ERR_INIT;
        goto cleanup;
    }

1306
    /* rv == 1, means we setup everything from saved state,
1307 1308 1309
     * so only (possibly) daemonize and setup stuff from
     * scratch if rv == 0
     */
1310
    if (rv == 0) {
1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327
        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 */
1328
        if ((pid_file_fd = virPidFileAcquirePath(pid_file, false, getpid())) < 0) {
1329 1330 1331 1332
            ret = VIR_LOCK_DAEMON_ERR_PIDFILE;
            goto cleanup;
        }

1333
        if (!(lockDaemon = virLockDaemonNew(config, privileged))) {
1334 1335 1336
            ret = VIR_LOCK_DAEMON_ERR_INIT;
            goto cleanup;
        }
1337

1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348
        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;
        }
1349 1350
    }

1351 1352 1353 1354 1355 1356
    if (timeout != -1) {
        VIR_DEBUG("Registering shutdown timeout %d", timeout);
        virNetServerAutoShutdown(lockDaemon->srv,
                                 timeout);
    }

1357 1358 1359 1360 1361
    if ((virLockDaemonSetupSignals(lockDaemon->srv)) < 0) {
        ret = VIR_LOCK_DAEMON_ERR_SIGNAL;
        goto cleanup;
    }

1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373
    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;
    }

1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393
    /* 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);
1394 1395

    if (execRestart &&
1396 1397 1398
        virLockDaemonPreExecRestart(state_file,
                                    lockDaemon->srv,
                                    argv) < 0)
1399
        ret = VIR_LOCK_DAEMON_ERR_REEXEC;
1400 1401
    else
        ret = 0;
1402

1403
 cleanup:
1404
    virObjectUnref(lockProgram);
1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419
    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);
1420
    VIR_FREE(state_file);
1421 1422
    VIR_FREE(run_dir);
    return ret;
1423

1424
 no_memory:
1425 1426
    VIR_ERROR(_("Can't allocate memory"));
    exit(EXIT_FAILURE);
1427
}