--- /dev/null
+/*
+ * qemu_dbus.c: QEMU dbus daemon
+ *
+ * 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/>.
+ */
+
+#include <config.h>
+
+#include "qemu_extdevice.h"
+#include "qemu_dbus.h"
+#include "qemu_security.h"
+
+#include "viralloc.h"
+#include "virlog.h"
+#include "virstring.h"
+#include "virtime.h"
+#include "virpidfile.h"
+
+#define VIR_FROM_THIS VIR_FROM_NONE
+
+VIR_LOG_INIT("qemu.dbus");
+
+
+int
+qemuDBusPrepareHost(virQEMUDriverPtr driver)
+{
+ g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
+
+ return virDirCreate(cfg->dbusStateDir, 0770, cfg->user, cfg->group,
+ VIR_DIR_CREATE_ALLOW_EXIST);
+}
+
+
+static char *
+qemuDBusCreatePidFilename(virQEMUDriverConfigPtr cfg,
+ const char *shortName)
+{
+ g_autofree char *name = g_strdup_printf("%s-dbus", shortName);
+
+ return virPidFileBuildPath(cfg->dbusStateDir, name);
+}
+
+
+static char *
+qemuDBusCreateFilename(const char *stateDir,
+ const char *shortName,
+ const char *ext)
+{
+ g_autofree char *name = g_strdup_printf("%s-dbus", shortName);
+
+ return virFileBuildPath(stateDir, name, ext);
+}
+
+
+static char *
+qemuDBusCreateSocketPath(virQEMUDriverConfigPtr cfg,
+ const char *shortName)
+{
+ return qemuDBusCreateFilename(cfg->dbusStateDir, shortName, ".sock");
+}
+
+
+static char *
+qemuDBusCreateConfPath(virQEMUDriverConfigPtr cfg,
+ const char *shortName)
+{
+ return qemuDBusCreateFilename(cfg->dbusStateDir, shortName, ".conf");
+}
+
+
+char *
+qemuDBusGetAddress(virQEMUDriverPtr driver,
+ virDomainObjPtr vm)
+{
+ g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
+ g_autofree char *shortName = virDomainDefGetShortName(vm->def);
+ g_autofree char *path = NULL;
+
+ if (!shortName)
+ return NULL;
+
+ path = qemuDBusCreateSocketPath(cfg, shortName);
+
+ return g_strdup_printf("unix:path=%s", path);
+}
+
+
+static int
+qemuDBusWriteConfig(const char *filename, const char *path)
+{
+ virBuffer buf = VIR_BUFFER_INITIALIZER;
+ g_autofree char *config = NULL;
+
+ virBufferAddLit(&buf, "<!DOCTYPE busconfig PUBLIC \"-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN\"\n");
+ virBufferAddLit(&buf, " \"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd\">\n");
+ virBufferAddLit(&buf, "<busconfig>\n");
+ virBufferAdjustIndent(&buf, 2);
+
+ virBufferAddLit(&buf, "<type>org.libvirt.qemu</type>\n");
+ virBufferAsprintf(&buf, "<listen>unix:path=%s</listen>\n", path);
+ virBufferAddLit(&buf, "<auth>EXTERNAL</auth>\n");
+
+ virBufferAddLit(&buf, "<policy context='default'>\n");
+ virBufferAdjustIndent(&buf, 2);
+ virBufferAddLit(&buf, "<!-- Allow everything to be sent -->\n");
+ virBufferAddLit(&buf, "<allow send_destination='*' eavesdrop='true'/>\n");
+ virBufferAddLit(&buf, "<!-- Allow everything to be received -->\n");
+ virBufferAddLit(&buf, "<allow eavesdrop='true'/>\n");
+ virBufferAddLit(&buf, "<!-- Allow anyone to own anything -->\n");
+ virBufferAddLit(&buf, "<allow own='*'/>\n");
+ virBufferAdjustIndent(&buf, -2);
+ virBufferAddLit(&buf, "</policy>\n");
+
+ virBufferAddLit(&buf, "<include if_selinux_enabled='yes' selinux_root_relative='yes'>contexts/dbus_contexts</include>\n");
+
+ virBufferAdjustIndent(&buf, -2);
+ virBufferAddLit(&buf, "</busconfig>\n");
+
+ config = virBufferContentAndReset(&buf);
+
+ return virFileWriteStr(filename, config, 0600);
+}
+
+
+void
+qemuDBusStop(virQEMUDriverPtr driver,
+ virDomainObjPtr vm)
+{
+ g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
+ qemuDomainObjPrivatePtr priv = vm->privateData;
+ g_autofree char *shortName = NULL;
+ g_autofree char *pidfile = NULL;
+ g_autofree char *configfile = NULL;
+
+ if (!(shortName = virDomainDefGetShortName(vm->def)))
+ return;
+
+ pidfile = qemuDBusCreatePidFilename(cfg, shortName);
+ configfile = qemuDBusCreateConfPath(cfg, shortName);
+
+ if (virPidFileForceCleanupPath(pidfile) < 0) {
+ VIR_WARN("Unable to kill dbus-daemon process");
+ } else {
+ priv->dbusDaemonRunning = false;
+ }
+}
+
+
+int
+qemuDBusStart(virQEMUDriverPtr driver,
+ virDomainObjPtr vm)
+{
+ g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
+ qemuDomainObjPrivatePtr priv = vm->privateData;
+ g_autoptr(virCommand) cmd = NULL;
+ g_autofree char *shortName = NULL;
+ g_autofree char *pidfile = NULL;
+ g_autofree char *configfile = NULL;
+ g_autofree char *sockpath = NULL;
+ virTimeBackOffVar timebackoff;
+ const unsigned long long timeout = 500 * 1000; /* ms */
+ VIR_AUTOCLOSE errfd = -1;
+ int cmdret = 0;
+ int exitstatus = 0;
+ pid_t cpid = -1;
+ int ret = -1;
+
+ if (!virFileIsExecutable(cfg->dbusDaemonName)) {
+ virReportSystemError(errno,
+ _("'%s' is not a suitable dbus-daemon"),
+ cfg->dbusDaemonName);
+ return -1;
+ }
+
+ if (!(shortName = virDomainDefGetShortName(vm->def)))
+ return -1;
+
+ pidfile = qemuDBusCreatePidFilename(cfg, shortName);
+ configfile = qemuDBusCreateConfPath(cfg, shortName);
+ sockpath = qemuDBusCreateSocketPath(cfg, shortName);
+
+ if (qemuDBusWriteConfig(configfile, sockpath) < 0) {
+ virReportSystemError(errno, _("Failed to write '%s'"), configfile);
+ return -1;
+ }
+
+ if (qemuSecurityDomainSetPathLabel(driver, vm, configfile, false) < 0)
+ goto cleanup;
+
+ cmd = virCommandNew(cfg->dbusDaemonName);
+ virCommandClearCaps(cmd);
+ virCommandSetPidFile(cmd, pidfile);
+ virCommandSetErrorFD(cmd, &errfd);
+ virCommandDaemonize(cmd);
+ virCommandAddArgFormat(cmd, "--config-file=%s", configfile);
+
+ if (qemuSecurityCommandRun(driver, vm, cmd, -1, -1,
+ &exitstatus, &cmdret) < 0)
+ goto cleanup;
+
+ if (cmdret < 0 || exitstatus != 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Could not start dbus-daemon. exitstatus: %d"), exitstatus);
+ goto cleanup;
+ }
+
+ if (virPidFileReadPath(pidfile, &cpid) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("dbus-daemon %s didn't show up"),
+ cfg->dbusDaemonName);
+ goto cleanup;
+ }
+
+ if (virTimeBackOffStart(&timebackoff, 1, timeout) < 0)
+ goto cleanup;
+ while (virTimeBackOffWait(&timebackoff)) {
+ char errbuf[1024] = { 0 };
+
+ if (virFileExists(sockpath))
+ break;
+
+ if (virProcessKill(cpid, 0) == 0)
+ continue;
+
+ if (saferead(errfd, errbuf, sizeof(errbuf) - 1) < 0) {
+ virReportSystemError(errno,
+ _("dbus-daemon %s died unexpectedly"),
+ cfg->dbusDaemonName);
+ } else {
+ virReportError(VIR_ERR_OPERATION_FAILED,
+ _("dbus-daemon died and reported: %s"), errbuf);
+ }
+
+ goto cleanup;
+ }
+
+ if (!virFileExists(sockpath)) {
+ virReportError(VIR_ERR_OPERATION_TIMEOUT,
+ _("DBus daemon %s didn't show up"),
+ cfg->dbusDaemonName);
+ goto cleanup;
+ }
+
+ if (priv->cgroup &&
+ virCgroupAddProcess(priv->cgroup, cpid) < 0)
+ goto cleanup;
+
+ if (qemuSecurityDomainSetPathLabel(driver, vm, sockpath, false) < 0)
+ goto cleanup;
+
+ priv->dbusDaemonRunning = true;
+ ret = 0;
+ cleanup:
+ if (ret < 0) {
+ virCommandAbort(cmd);
+ if (cpid >= 0)
+ virProcessKillPainfully(cpid, true);
+ unlink(pidfile);
+ unlink(configfile);
+ unlink(sockpath);
+ }
+ return ret;
+}
projects / thirdparty / libvirt.git / commitdiff
