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libvirt/src/util/virsystemd.c
Michal Privoznik 862298a2e7 dbus: Don't unref NULL messages 
Apparently we are not the only ones with dumb free functions
because dbus_message_unref() does not accept NULL either. But if
I were to vote, this one is even more evil. Instead of returning
an error just like we do it immediately dereference any pointer
passed and thus crash you app. Well done DBus!

  Program received signal SIGSEGV, Segmentation fault.
  [Switching to Thread 0x7f878ebda700 (LWP 31264)]
  0x00007f87be4016e5 in ?? () from /usr/lib64/libdbus-1.so.3
  (gdb) bt
  #0  0x00007f87be4016e5 in ?? () from /usr/lib64/libdbus-1.so.3
  #1  0x00007f87be3f004e in dbus_message_unref () from /usr/lib64/libdbus-1.so.3
  #2  0x00007f87bf6ecf95 in virSystemdGetMachineNameByPID (pid=9849) at util/virsystemd.c:228
  #3  0x00007f879761bd4d in qemuConnectCgroup (driver=0x7f87600a32a0, vm=0x7f87600c7550) at qemu/qemu_cgroup.c:909
  #4  0x00007f87976386b7 in qemuProcessReconnect (opaque=0x7f87600db840) at qemu/qemu_process.c:3386
  #5  0x00007f87bf6edfff in virThreadHelper (data=0x7f87600d5580) at util/virthread.c:206
  #6  0x00007f87bb602334 in start_thread (arg=0x7f878ebda700) at pthread_create.c:333
  #7  0x00007f87bb3481bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
  (gdb) frame 2
  #2  0x00007f87bf6ecf95 in virSystemdGetMachineNameByPID (pid=9849) at util/virsystemd.c:228
  228         dbus_message_unref(reply);
  (gdb) p reply
  $1 = (DBusMessage *) 0x0

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
2016-02-11 11:35:02 +01:00

546 lines
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/*
* virsystemd.c: helpers for using systemd APIs
*
* Copyright (C) 2013, 2014 Red Hat, Inc.
*
* 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>
#ifdef WITH_SYSTEMD_DAEMON
# include <systemd/sd-daemon.h>
#endif
#include "virsystemd.h"
#include "viratomic.h"
#include "virbuffer.h"
#include "virdbus.h"
#include "virstring.h"
#include "viralloc.h"
#include "virutil.h"
#include "virlog.h"
#include "virerror.h"
#define VIR_FROM_THIS VIR_FROM_SYSTEMD
VIR_LOG_INIT("util.systemd");
static void virSystemdEscapeName(virBufferPtr buf,
const char *name)
{
static const char hextable[16] = "0123456789abcdef";
#define ESCAPE(c) \
do { \
virBufferAddChar(buf, '\\'); \
virBufferAddChar(buf, 'x'); \
virBufferAddChar(buf, hextable[(c >> 4) & 15]); \
virBufferAddChar(buf, hextable[c & 15]); \
} while (0)
#define VALID_CHARS \
"0123456789" \
"abcdefghijklmnopqrstuvwxyz" \
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
":-_.\\"
if (*name == '.') {
ESCAPE(*name);
name++;
}
while (*name) {
if (*name == '/')
virBufferAddChar(buf, '-');
else if (*name == '-' ||
*name == '\\' ||
!strchr(VALID_CHARS, *name))
ESCAPE(*name);
else
virBufferAddChar(buf, *name);
name++;
}
#undef ESCAPE
#undef VALID_CHARS
}
char *virSystemdMakeScopeName(const char *name,
const char *drivername,
bool legacy_behaviour)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
virBufferAddLit(&buf, "machine-");
if (legacy_behaviour) {
virSystemdEscapeName(&buf, drivername);
virBufferAddLit(&buf, "\\x2d");
}
virSystemdEscapeName(&buf, name);
virBufferAddLit(&buf, ".scope");
if (virBufferCheckError(&buf) < 0)
return NULL;
return virBufferContentAndReset(&buf);
}
char *virSystemdMakeSliceName(const char *partition)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
if (*partition == '/')
partition++;
virSystemdEscapeName(&buf, partition);
virBufferAddLit(&buf, ".slice");
if (virBufferCheckError(&buf) < 0)
return NULL;
return virBufferContentAndReset(&buf);
}
#define HOSTNAME_CHARS \
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-"
static void
virSystemdAppendValidMachineName(virBufferPtr buf,
const char *name)
{
bool skip_dot = false;
for (; *name; name++) {
if (strlen(virBufferCurrentContent(buf)) >= 64)
break;
if (*name == '.') {
if (!skip_dot)
virBufferAddChar(buf, *name);
skip_dot = true;
continue;
}
skip_dot = false;
if (!strchr(HOSTNAME_CHARS, *name))
continue;
virBufferAddChar(buf, *name);
}
}
#undef HOSTNAME_CHARS
char *
virSystemdMakeMachineName(const char *drivername,
int id,
const char *name,
bool privileged)
{
char *machinename = NULL;
char *username = NULL;
virBuffer buf = VIR_BUFFER_INITIALIZER;
if (privileged) {
virBufferAsprintf(&buf, "%s-", drivername);
} else {
if (!(username = virGetUserName(geteuid())))
goto cleanup;
virBufferAsprintf(&buf, "%s-%s-", username, drivername);
}
virBufferAsprintf(&buf, "%d-", id);
virSystemdAppendValidMachineName(&buf, name);
machinename = virBufferContentAndReset(&buf);
cleanup:
VIR_FREE(username);
return machinename;
}
char *
virSystemdGetMachineNameByPID(pid_t pid)
{
DBusConnection *conn;
DBusMessage *reply = NULL;
char *name = NULL, *object = NULL;
if (virDBusIsServiceEnabled("org.freedesktop.machine1") < 0)
goto cleanup;
if (virDBusIsServiceRegistered("org.freedesktop.systemd1") < 0)
goto cleanup;
if (!(conn = virDBusGetSystemBus()))
goto cleanup;
if (virDBusCallMethod(conn, &reply, NULL,
"org.freedesktop.machine1",
"/org/freedesktop/machine1",
"org.freedesktop.machine1.Manager",
"GetMachineByPID",
"u", pid) < 0)
goto cleanup;
if (virDBusMessageRead(reply, "o", &object) < 0)
goto cleanup;
VIR_DEBUG("Domain with pid %llu has object path '%s'",
(unsigned long long)pid, object);
if (virDBusCallMethod(conn, &reply, NULL,
"org.freedesktop.machine1",
object,
"org.freedesktop.DBus.Properties",
"Get",
"ss",
"org.freedesktop.machine1.Machine",
"Name") < 0)
goto cleanup;
if (virDBusMessageRead(reply, "v", "s", &name) < 0)
goto cleanup;
VIR_DEBUG("Domain with pid %llu has machine name '%s'",
(unsigned long long)pid, name);
cleanup:
VIR_FREE(object);
virDBusMessageUnref(reply);
return name;
}
/**
* virSystemdCreateMachine:
* @name: driver unique name of the machine
* @drivername: name of the virt driver
* @privileged: whether driver is running privileged or per user
* @uuid: globally unique UUID of the machine
* @rootdir: root directory of machine filesystem
* @pidleader: PID of the leader process
* @iscontainer: true if a container, false if a VM
* @nnicindexes: number of network interface indexes in list
* @nicindexes: list of network interface indexes
* @partition: name of the slice to place the machine in
*
* Returns 0 on success, -1 on fatal error, or -2 if systemd-machine is not available
*/
int virSystemdCreateMachine(const char *name,
const char *drivername,
const unsigned char *uuid,
const char *rootdir,
pid_t pidleader,
bool iscontainer,
size_t nnicindexes,
int *nicindexes,
const char *partition)
{
int ret;
DBusConnection *conn;
char *creatorname = NULL;
char *slicename = NULL;
static int hasCreateWithNetwork = 1;
ret = virDBusIsServiceEnabled("org.freedesktop.machine1");
if (ret < 0)
return ret;
if ((ret = virDBusIsServiceRegistered("org.freedesktop.systemd1")) < 0)
return ret;
if (!(conn = virDBusGetSystemBus()))
return -1;
ret = -1;
if (virAsprintf(&creatorname, "libvirt-%s", drivername) < 0)
goto cleanup;
if (partition) {
if (!(slicename = virSystemdMakeSliceName(partition)))
goto cleanup;
} else {
if (VIR_STRDUP(slicename, "") < 0)
goto cleanup;
}
/*
* The systemd DBus APIs we're invoking have the
* following signature(s)
*
* CreateMachineWithNetwork(in s name,
* in ay id,
* in s service,
* in s class,
* in u leader,
* in s root_directory,
* in ai nicindexes
* in a(sv) scope_properties,
* out o path);
*
* CreateMachine(in s name,
* in ay id,
* in s service,
* in s class,
* in u leader,
* in s root_directory,
* in a(sv) scope_properties,
* out o path);
*
* @name a host unique name for the machine. shows up
* in 'ps' listing & similar
*
* @id: a UUID of the machine, ideally matching /etc/machine-id
* for containers
*
* @service: identifier of the client ie "libvirt-lxc"
*
* @class: either the string "container" or "vm" depending
* on the type of machine
*
* @leader: main PID of the machine, either the host emulator
* process, or the 'init' PID of the container
*
* @root_directory: the root directory of the container, if
* this is known & visible in the host filesystem, or empty string
*
* @nicindexes: list of network interface indexes for the
* host end of the VETH device pairs.
*
* @scope_properties:an array (not a dict!) of properties that are
* passed on to PID 1 when creating a scope unit for your machine.
* Will allow initial settings for the cgroup & similar.
*
* @path: a bus path returned for the machine object created, to
* allow further API calls to be made against the object.
*
*/
VIR_DEBUG("Attempting to create machine via systemd");
if (virAtomicIntGet(&hasCreateWithNetwork)) {
virError error;
memset(&error, 0, sizeof(error));
if (virDBusCallMethod(conn,
NULL,
&error,
"org.freedesktop.machine1",
"/org/freedesktop/machine1",
"org.freedesktop.machine1.Manager",
"CreateMachineWithNetwork",
"sayssusa&ia(sv)",
name,
16,
uuid[0], uuid[1], uuid[2], uuid[3],
uuid[4], uuid[5], uuid[6], uuid[7],
uuid[8], uuid[9], uuid[10], uuid[11],
uuid[12], uuid[13], uuid[14], uuid[15],
creatorname,
iscontainer ? "container" : "vm",
(unsigned int)pidleader,
rootdir ? rootdir : "",
nnicindexes, nicindexes,
3,
"Slice", "s", slicename,
"After", "as", 1, "libvirtd.service",
"Before", "as", 1, "libvirt-guests.service") < 0)
goto cleanup;
if (error.level == VIR_ERR_ERROR) {
if (virDBusErrorIsUnknownMethod(&error)) {
VIR_INFO("CreateMachineWithNetwork isn't supported, switching "
"to legacy CreateMachine method for systemd-machined");
virResetError(&error);
virAtomicIntSet(&hasCreateWithNetwork, 0);
/* Could re-structure without Using goto, but this
* avoids another atomic read which would trigger
* another memory barrier */
goto fallback;
}
virReportErrorObject(&error);
virResetError(&error);
goto cleanup;
}
} else {
fallback:
if (virDBusCallMethod(conn,
NULL,
NULL,
"org.freedesktop.machine1",
"/org/freedesktop/machine1",
"org.freedesktop.machine1.Manager",
"CreateMachine",
"sayssusa(sv)",
name,
16,
uuid[0], uuid[1], uuid[2], uuid[3],
uuid[4], uuid[5], uuid[6], uuid[7],
uuid[8], uuid[9], uuid[10], uuid[11],
uuid[12], uuid[13], uuid[14], uuid[15],
creatorname,
iscontainer ? "container" : "vm",
(unsigned int)pidleader,
rootdir ? rootdir : "",
3,
"Slice", "s", slicename,
"After", "as", 1, "libvirtd.service",
"Before", "as", 1, "libvirt-guests.service") < 0)
goto cleanup;
}
ret = 0;
cleanup:
VIR_FREE(creatorname);
VIR_FREE(slicename);
return ret;
}
int virSystemdTerminateMachine(const char *name)
{
int ret;
DBusConnection *conn;
virError error;
if (!name)
return 0;
memset(&error, 0, sizeof(error));
ret = virDBusIsServiceEnabled("org.freedesktop.machine1");
if (ret < 0)
goto cleanup;
if ((ret = virDBusIsServiceRegistered("org.freedesktop.systemd1")) < 0)
goto cleanup;
ret = -1;
if (!(conn = virDBusGetSystemBus()))
goto cleanup;
/*
* The systemd DBus API we're invoking has the
* following signature
*
* TerminateMachine(in s name);
*
* @name a host unique name for the machine. shows up
* in 'ps' listing & similar
*/
VIR_DEBUG("Attempting to terminate machine via systemd");
if (virDBusCallMethod(conn,
NULL,
&error,
"org.freedesktop.machine1",
"/org/freedesktop/machine1",
"org.freedesktop.machine1.Manager",
"TerminateMachine",
"s",
name) < 0)
goto cleanup;
if (error.code == VIR_ERR_ERROR &&
STRNEQ_NULLABLE("org.freedesktop.machine1.NoSuchMachine",
error.str1)) {
virReportErrorObject(&error);
goto cleanup;
}
ret = 0;
cleanup:
virResetError(&error);
return ret;
}
void
virSystemdNotifyStartup(void)
{
#ifdef WITH_SYSTEMD_DAEMON
sd_notify(0, "READY=1");
#endif
}
static int
virSystemdPMSupportTarget(const char *methodName, bool *result)
{
int ret;
DBusConnection *conn;
DBusMessage *message = NULL;
char *response;
ret = virDBusIsServiceEnabled("org.freedesktop.login1");
if (ret < 0)
return ret;
if ((ret = virDBusIsServiceRegistered("org.freedesktop.login1")) < 0)
return ret;
if (!(conn = virDBusGetSystemBus()))
return -1;
ret = -1;
if (virDBusCallMethod(conn,
&message,
NULL,
"org.freedesktop.login1",
"/org/freedesktop/login1",
"org.freedesktop.login1.Manager",
methodName,
NULL) < 0)
return ret;
if ((ret = virDBusMessageRead(message, "s", &response)) < 0)
goto cleanup;
*result = STREQ("yes", response) || STREQ("challenge", response);
ret = 0;
cleanup:
virDBusMessageUnref(message);
VIR_FREE(response);
return ret;
}
int virSystemdCanSuspend(bool *result)
{
return virSystemdPMSupportTarget("CanSuspend", result);
}
int virSystemdCanHibernate(bool *result)
{
return virSystemdPMSupportTarget("CanHibernate", result);
}
int virSystemdCanHybridSleep(bool *result)
{
return virSystemdPMSupportTarget("CanHybridSleep", result);
}
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