libvirt/src/datatypes.h

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/*
* datatypes.h: management of structs for public data types
*
* Copyright (C) 2006-2014 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/>.
*
*/
#ifndef __VIR_DATATYPES_H_
# define __VIR_DATATYPES_H_
# include "internal.h"
# include "driver.h"
# include "virthread.h"
# include "virobject.h"
# include "viruuid.h"
extern virClassPtr virConnectClass;
extern virClassPtr virDomainClass;
extern virClassPtr virDomainSnapshotClass;
extern virClassPtr virInterfaceClass;
extern virClassPtr virNetworkClass;
extern virClassPtr virNodeDeviceClass;
extern virClassPtr virNWFilterClass;
extern virClassPtr virSecretClass;
extern virClassPtr virStreamClass;
extern virClassPtr virStorageVolClass;
extern virClassPtr virStoragePoolClass;
# define virCheckConnectReturn(obj, retval) \
do { \
if (!virObjectIsClass(obj, virConnectClass)) { \
virReportErrorHelper(VIR_FROM_THIS, VIR_ERR_INVALID_CONN, \
__FILE__, __FUNCTION__, __LINE__, \
__FUNCTION__); \
virDispatchError(NULL); \
return retval; \
} \
} while (0)
# define virCheckConnectGoto(obj, label) \
do { \
if (!virObjectIsClass(obj, virConnectClass)) { \
virReportErrorHelper(VIR_FROM_THIS, VIR_ERR_INVALID_CONN, \
__FILE__, __FUNCTION__, __LINE__, \
__FUNCTION__); \
goto label; \
} \
} while (0)
# define virCheckDomainReturn(obj, retval) \
do { \
virDomainPtr _dom = (obj); \
if (!virObjectIsClass(_dom, virDomainClass) || \
!virObjectIsClass(_dom->conn, virConnectClass)) { \
virReportErrorHelper(VIR_FROM_DOM, VIR_ERR_INVALID_DOMAIN, \
__FILE__, __FUNCTION__, __LINE__, \
__FUNCTION__); \
virDispatchError(NULL); \
return retval; \
} \
} while (0)
# define virCheckDomainGoto(obj, label) \
do { \
virDomainPtr _dom = (obj); \
if (!virObjectIsClass(_dom, virDomainClass) || \
!virObjectIsClass(_dom->conn, virConnectClass)) { \
virReportErrorHelper(VIR_FROM_DOM, VIR_ERR_INVALID_DOMAIN, \
__FILE__, __FUNCTION__, __LINE__, \
__FUNCTION__); \
goto label; \
} \
} while (0)
# define virCheckNetworkReturn(obj, retval) \
do { \
virNetworkPtr _net = (obj); \
if (!virObjectIsClass(_net, virNetworkClass) || \
!virObjectIsClass(_net->conn, virConnectClass)) { \
virReportErrorHelper(VIR_FROM_NETWORK, \
VIR_ERR_INVALID_NETWORK, \
__FILE__, __FUNCTION__, __LINE__, \
__FUNCTION__); \
virDispatchError(NULL); \
return retval; \
} \
} while (0)
# define virCheckNetworkGoto(obj, label) \
do { \
virNetworkPtr _net = (obj); \
if (!virObjectIsClass(_net, virNetworkClass) || \
!virObjectIsClass(_net->conn, virConnectClass)) { \
virReportErrorHelper(VIR_FROM_NETWORK, \
VIR_ERR_INVALID_NETWORK, \
__FILE__, __FUNCTION__, __LINE__, \
__FUNCTION__); \
goto label; \
} \
} while (0)
# define virCheckInterfaceReturn(obj, retval) \
do { \
virInterfacePtr _iface = (obj); \
if (!virObjectIsClass(_iface, virInterfaceClass) || \
!virObjectIsClass(_iface->conn, virConnectClass)) { \
virReportErrorHelper(VIR_FROM_INTERFACE, \
VIR_ERR_INVALID_INTERFACE, \
__FILE__, __FUNCTION__, __LINE__, \
__FUNCTION__); \
virDispatchError(NULL); \
return retval; \
} \
} while (0)
# define virCheckStoragePoolReturn(obj, retval) \
do { \
virStoragePoolPtr _pool = (obj); \
if (!virObjectIsClass(_pool, virStoragePoolClass) || \
!virObjectIsClass(_pool->conn, virConnectClass)) { \
virReportErrorHelper(VIR_FROM_STORAGE, \
VIR_ERR_INVALID_STORAGE_POOL, \
__FILE__, __FUNCTION__, __LINE__, \
__FUNCTION__); \
virDispatchError(NULL); \
return retval; \
} \
} while (0)
# define virCheckStorageVolReturn(obj, retval) \
do { \
virStorageVolPtr _vol = (obj); \
if (!virObjectIsClass(_vol, virStorageVolClass) || \
!virObjectIsClass(_vol->conn, virConnectClass)) { \
virReportErrorHelper(VIR_FROM_STORAGE, \
VIR_ERR_INVALID_STORAGE_VOL, \
__FILE__, __FUNCTION__, __LINE__, \
__FUNCTION__); \
virDispatchError(NULL); \
return retval; \
} \
} while (0)
# define virCheckStorageVolGoto(obj, label) \
do { \
virStorageVolPtr _vol = (obj); \
if (!virObjectIsClass(_vol, virStorageVolClass) || \
!virObjectIsClass(_vol->conn, virConnectClass)) { \
virReportErrorHelper(VIR_FROM_STORAGE, \
VIR_ERR_INVALID_STORAGE_VOL, \
__FILE__, __FUNCTION__, __LINE__, \
__FUNCTION__); \
goto label; \
} \
} while (0)
# define virCheckNodeDeviceReturn(obj, retval) \
do { \
virNodeDevicePtr _node = (obj); \
if (!virObjectIsClass(_node, virNodeDeviceClass) || \
!virObjectIsClass(_node->conn, virConnectClass)) { \
virReportErrorHelper(VIR_FROM_NODEDEV, \
VIR_ERR_INVALID_NODE_DEVICE, \
__FILE__, __FUNCTION__, __LINE__, \
__FUNCTION__); \
virDispatchError(NULL); \
return retval; \
} \
} while (0)
# define virCheckSecretReturn(obj, retval) \
do { \
virSecretPtr _secret = (obj); \
if (!virObjectIsClass(_secret, virSecretClass) || \
!virObjectIsClass(_secret->conn, virConnectClass)) { \
virReportErrorHelper(VIR_FROM_SECRET, \
VIR_ERR_INVALID_SECRET, \
__FILE__, __FUNCTION__, __LINE__, \
__FUNCTION__); \
virDispatchError(NULL); \
return retval; \
} \
} while (0)
# define virCheckStreamReturn(obj, retval) \
do { \
virStreamPtr _st = (obj); \
if (!virObjectIsClass(_st, virStreamClass) || \
!virObjectIsClass(_st->conn, virConnectClass)) { \
virReportErrorHelper(VIR_FROM_STREAMS, \
VIR_ERR_INVALID_STREAM, \
__FILE__, __FUNCTION__, __LINE__, \
__FUNCTION__); \
virDispatchError(NULL); \
return retval; \
} \
} while (0)
# define virCheckStreamGoto(obj, label) \
do { \
virStreamPtr _st = (obj); \
if (!virObjectIsClass(_st, virStreamClass) || \
!virObjectIsClass(_st->conn, virConnectClass)) { \
virReportErrorHelper(VIR_FROM_STREAMS, \
VIR_ERR_INVALID_STREAM, \
__FILE__, __FUNCTION__, __LINE__, \
__FUNCTION__); \
goto label; \
} \
} while (0)
# define virCheckNWFilterReturn(obj, retval) \
do { \
virNWFilterPtr _nw = (obj); \
if (!virObjectIsClass(_nw, virNWFilterClass) || \
!virObjectIsClass(_nw->conn, virConnectClass)) { \
virReportErrorHelper(VIR_FROM_NWFILTER, \
VIR_ERR_INVALID_NWFILTER, \
__FILE__, __FUNCTION__, __LINE__, \
__FUNCTION__); \
virDispatchError(NULL); \
return retval; \
} \
} while (0)
# define virCheckDomainSnapshotReturn(obj, retval) \
do { \
virDomainSnapshotPtr _snap = (obj); \
if (!virObjectIsClass(_snap, virDomainSnapshotClass) || \
!virObjectIsClass(_snap->domain, virDomainClass) || \
!virObjectIsClass(_snap->domain->conn, virConnectClass)) { \
virReportErrorHelper(VIR_FROM_DOMAIN_SNAPSHOT, \
VIR_ERR_INVALID_DOMAIN_SNAPSHOT, \
__FILE__, __FUNCTION__, __LINE__, \
__FUNCTION__); \
virDispatchError(NULL); \
return retval; \
} \
} while (0)
rpc: Fix connection close callback race condition and memory corruption/crash The last Viktor's effort to fix the race and memory corruption unfortunately wasn't complete in the case the close callback was not registered in an connection. At that time, the trail of event's that I'll describe later could still happen and corrupt the memory or cause a crash of the client (including the daemon in case of a p2p migration). Consider the following prerequisities and trail of events: Let's have a remote connection to a hypervisor that doesn't have a close callback registered and the client is using the event loop. The crash happens in cooperation of 2 threads. Thread E is the event loop and thread W is the worker that does some stuff. R denotes the remote client. 1.) W - The client finishes everything and sheds the last reference on the client 2.) W - The virObject stuff invokes virConnectDispose that invokes doRemoteClose 3.) W - the remote close method invokes the REMOTE_PROC_CLOSE RPC method. 4.) W - The thread is preempted at this point. 5.) R - The remote side receives the close and closes the socket. 6.) E - poll() wakes up due to the closed socket and invokes the close callback 7.) E - The event loop is preempted right before remoteClientCloseFunc is called 8.) W - The worker now finishes, and frees the conn object. 9.) E - The remoteClientCloseFunc accesses the now-freed conn object in the attempt to retrieve pointer for the real close callback. 10.) Kaboom, corrupted memory/segfault. This patch tries to fix this by introducing a new object that survives the freeing of the connection object. We can't increase the reference count on the connection object itself or the connection would never be closed, as the connection is closed only when the reference count reaches zero. The new object - virConnectCloseCallbackData - is a lockable object that keeps the pointers to the real user registered callback and ensures that the connection callback is either not called if the connection was already freed or that the connection isn't freed while this is being called.
2013-03-29 17:21:19 +00:00
/* Helper macros to implement VIR_DOMAIN_DEBUG using just C99. This
* assumes you pass fewer than 15 arguments to VIR_DOMAIN_DEBUG, but
* can easily be expanded if needed.
*
* Note that gcc provides extensions of "define a(b...) b" or
* "define a(b,...) b,##__VA_ARGS__" as a means of eliding a comma
* when no var-args are present, but we don't want to require gcc.
*/
# define VIR_ARG15(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, \
_11, _12, _13, _14, _15, ...) _15
# define VIR_HAS_COMMA(...) VIR_ARG15(__VA_ARGS__, \
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0)
/* Form the name VIR_DOMAIN_DEBUG_[01], then call that macro,
* according to how many arguments are present. Two-phase due to
* macro expansion rules. */
# define VIR_DOMAIN_DEBUG_EXPAND(a, b, ...) \
VIR_DOMAIN_DEBUG_PASTE(a, b, __VA_ARGS__)
# define VIR_DOMAIN_DEBUG_PASTE(a, b, ...) \
a##b(__VA_ARGS__)
/* Internal use only, when VIR_DOMAIN_DEBUG has one argument. */
# define VIR_DOMAIN_DEBUG_0(dom) \
VIR_DOMAIN_DEBUG_2(dom, "%s", "")
/* Internal use only, when VIR_DOMAIN_DEBUG has three or more arguments. */
# define VIR_DOMAIN_DEBUG_1(dom, fmt, ...) \
VIR_DOMAIN_DEBUG_2(dom, ", " fmt, __VA_ARGS__)
/* Internal use only, with final format. */
# define VIR_DOMAIN_DEBUG_2(dom, fmt, ...) \
do { \
char _uuidstr[VIR_UUID_STRING_BUFLEN]; \
const char *_domname = NULL; \
\
if (!virObjectIsClass(dom, virDomainClass)) { \
memset(_uuidstr, 0, sizeof(_uuidstr)); \
} else { \
virUUIDFormat((dom)->uuid, _uuidstr); \
_domname = (dom)->name; \
} \
\
VIR_DEBUG("dom=%p, (VM: name=%s, uuid=%s)" fmt, \
dom, NULLSTR(_domname), _uuidstr, __VA_ARGS__); \
} while (0)
/**
* VIR_DOMAIN_DEBUG:
* @dom: domain
* @fmt: optional format for additional information
* @...: optional arguments corresponding to @fmt.
*/
# define VIR_DOMAIN_DEBUG(...) \
VIR_DOMAIN_DEBUG_EXPAND(VIR_DOMAIN_DEBUG_, \
VIR_HAS_COMMA(__VA_ARGS__), \
__VA_ARGS__)
rpc: Fix connection close callback race condition and memory corruption/crash The last Viktor's effort to fix the race and memory corruption unfortunately wasn't complete in the case the close callback was not registered in an connection. At that time, the trail of event's that I'll describe later could still happen and corrupt the memory or cause a crash of the client (including the daemon in case of a p2p migration). Consider the following prerequisities and trail of events: Let's have a remote connection to a hypervisor that doesn't have a close callback registered and the client is using the event loop. The crash happens in cooperation of 2 threads. Thread E is the event loop and thread W is the worker that does some stuff. R denotes the remote client. 1.) W - The client finishes everything and sheds the last reference on the client 2.) W - The virObject stuff invokes virConnectDispose that invokes doRemoteClose 3.) W - the remote close method invokes the REMOTE_PROC_CLOSE RPC method. 4.) W - The thread is preempted at this point. 5.) R - The remote side receives the close and closes the socket. 6.) E - poll() wakes up due to the closed socket and invokes the close callback 7.) E - The event loop is preempted right before remoteClientCloseFunc is called 8.) W - The worker now finishes, and frees the conn object. 9.) E - The remoteClientCloseFunc accesses the now-freed conn object in the attempt to retrieve pointer for the real close callback. 10.) Kaboom, corrupted memory/segfault. This patch tries to fix this by introducing a new object that survives the freeing of the connection object. We can't increase the reference count on the connection object itself or the connection would never be closed, as the connection is closed only when the reference count reaches zero. The new object - virConnectCloseCallbackData - is a lockable object that keeps the pointers to the real user registered callback and ensures that the connection callback is either not called if the connection was already freed or that the connection isn't freed while this is being called.
2013-03-29 17:21:19 +00:00
typedef struct _virConnectCloseCallbackData virConnectCloseCallbackData;
typedef virConnectCloseCallbackData *virConnectCloseCallbackDataPtr;
/**
* Internal structure holding data related to connection close callbacks.
*/
struct _virConnectCloseCallbackData {
virObjectLockable parent;
virConnectPtr conn;
virConnectCloseFunc callback;
void *opaque;
virFreeCallback freeCallback;
};
/**
* _virConnect:
*
* Internal structure associated to a connection
*/
struct _virConnect {
virObject object;
2009-01-20 12:01:45 +00:00
/* All the variables from here, until the 'lock' declaration
* are setup at time of connection open, and never changed
* since. Thus no need to lock when accessing them
*/
unsigned int flags; /* a set of connection flags */
virURIPtr uri; /* connection URI */
/* The underlying hypervisor driver and network driver. */
virHypervisorDriverPtr driver;
virNetworkDriverPtr networkDriver;
virInterfaceDriverPtr interfaceDriver;
virStorageDriverPtr storageDriver;
virNodeDeviceDriverPtr nodeDeviceDriver;
virSecretDriverPtr secretDriver;
virNWFilterDriverPtr nwfilterDriver;
/* Private data pointer which can be used by driver and
* network driver as they wish.
* NB: 'private' is a reserved word in C++.
*/
void * privateData;
void * networkPrivateData;
void * interfacePrivateData;
void * storagePrivateData;
void * nodeDevicePrivateData;
void * secretPrivateData;
void * nwfilterPrivateData;
/*
* The lock mutex must be acquired before accessing/changing
* any of members following this point, or changing the ref
* count of any virDomain/virNetwork object associated with
* this connection
*/
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virMutex lock;
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/* Per-connection error. */
virError err; /* the last error */
virErrorFunc handler; /* associated handlet */
void *userData; /* the user data */
/* Per-connection close callback */
rpc: Fix connection close callback race condition and memory corruption/crash The last Viktor's effort to fix the race and memory corruption unfortunately wasn't complete in the case the close callback was not registered in an connection. At that time, the trail of event's that I'll describe later could still happen and corrupt the memory or cause a crash of the client (including the daemon in case of a p2p migration). Consider the following prerequisities and trail of events: Let's have a remote connection to a hypervisor that doesn't have a close callback registered and the client is using the event loop. The crash happens in cooperation of 2 threads. Thread E is the event loop and thread W is the worker that does some stuff. R denotes the remote client. 1.) W - The client finishes everything and sheds the last reference on the client 2.) W - The virObject stuff invokes virConnectDispose that invokes doRemoteClose 3.) W - the remote close method invokes the REMOTE_PROC_CLOSE RPC method. 4.) W - The thread is preempted at this point. 5.) R - The remote side receives the close and closes the socket. 6.) E - poll() wakes up due to the closed socket and invokes the close callback 7.) E - The event loop is preempted right before remoteClientCloseFunc is called 8.) W - The worker now finishes, and frees the conn object. 9.) E - The remoteClientCloseFunc accesses the now-freed conn object in the attempt to retrieve pointer for the real close callback. 10.) Kaboom, corrupted memory/segfault. This patch tries to fix this by introducing a new object that survives the freeing of the connection object. We can't increase the reference count on the connection object itself or the connection would never be closed, as the connection is closed only when the reference count reaches zero. The new object - virConnectCloseCallbackData - is a lockable object that keeps the pointers to the real user registered callback and ensures that the connection callback is either not called if the connection was already freed or that the connection isn't freed while this is being called.
2013-03-29 17:21:19 +00:00
virConnectCloseCallbackDataPtr closeCallback;
};
/**
* _virDomain:
*
* Internal structure associated to a domain
*/
struct _virDomain {
virObject object;
virConnectPtr conn; /* pointer back to the connection */
char *name; /* the domain external name */
int id; /* the domain ID */
unsigned char uuid[VIR_UUID_BUFLEN]; /* the domain unique identifier */
};
/**
* _virNetwork:
*
* Internal structure associated to a domain
*/
struct _virNetwork {
virObject object;
virConnectPtr conn; /* pointer back to the connection */
char *name; /* the network external name */
unsigned char uuid[VIR_UUID_BUFLEN]; /* the network unique identifier */
};
/**
* _virInterface:
*
* Internal structure associated to a physical host interface
*/
struct _virInterface {
virObject object;
virConnectPtr conn; /* pointer back to the connection */
char *name; /* the network external name */
char *mac; /* the interface MAC address */
};
/**
* _virStoragePool:
*
* Internal structure associated to a storage pool
*/
struct _virStoragePool {
virObject object;
virConnectPtr conn; /* pointer back to the connection */
char *name; /* the storage pool external name */
unsigned char uuid[VIR_UUID_BUFLEN]; /* the storage pool unique identifier */
/* Private data pointer which can be used by driver as they wish.
* Cleanup function pointer can be hooked to provide custom cleanup
* operation.
*/
void *privateData;
virFreeCallback privateDataFreeFunc;
};
/**
* _virStorageVol:
*
* Internal structure associated to a storage volume
*/
struct _virStorageVol {
virObject object;
virConnectPtr conn; /* pointer back to the connection */
char *pool; /* Pool name of owner */
char *name; /* the storage vol external name */
char *key; /* unique key for storage vol */
/* Private data pointer which can be used by driver as they wish.
* Cleanup function pointer can be hooked to provide custom cleanup
* operation.
*/
void *privateData;
virFreeCallback privateDataFreeFunc;
};
/**
* _virNodeDevice:
*
* Internal structure associated with a node device
*/
struct _virNodeDevice {
virObject object;
virConnectPtr conn; /* pointer back to the connection */
char *name; /* device name (unique on node) */
char *parent; /* parent device name */
};
/**
* _virSecret:
*
* Internal structure associated with a secret
*/
struct _virSecret {
virObject object;
virConnectPtr conn; /* pointer back to the connection */
unsigned char uuid[VIR_UUID_BUFLEN]; /* the secret unique identifier */
int usageType; /* the type of usage */
char *usageID; /* the usage's unique identifier */
};
typedef int (*virStreamAbortFunc)(virStreamPtr, void *opaque);
typedef int (*virStreamFinishFunc)(virStreamPtr, void *opaque);
/**
* _virStream:
*
* Internal structure associated with an input stream
*/
struct _virStream {
virObject object;
virConnectPtr conn;
unsigned int flags;
virStreamDriverPtr driver;
void *privateData;
};
/**
* _virDomainSnapshot
*
* Internal structure associated with a domain snapshot
*/
struct _virDomainSnapshot {
virObject object;
char *name;
virDomainPtr domain;
};
/**
* _virNWFilter:
*
* Internal structure associated to a network filter
*/
struct _virNWFilter {
virObject object;
virConnectPtr conn; /* pointer back to the connection */
char *name; /* the network filter external name */
unsigned char uuid[VIR_UUID_BUFLEN]; /* the network filter unique identifier */
};
/*
* Helper APIs for allocating new object instances
*/
virConnectPtr virGetConnect(void);
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virDomainPtr virGetDomain(virConnectPtr conn,
const char *name,
const unsigned char *uuid);
2008-11-17 11:03:25 +00:00
virNetworkPtr virGetNetwork(virConnectPtr conn,
const char *name,
const unsigned char *uuid);
virInterfacePtr virGetInterface(virConnectPtr conn,
const char *name,
const char *mac);
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virStoragePoolPtr virGetStoragePool(virConnectPtr conn,
const char *name,
const unsigned char *uuid,
void *privateData,
virFreeCallback freeFunc);
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virStorageVolPtr virGetStorageVol(virConnectPtr conn,
const char *pool,
const char *name,
const char *key,
void *privateData,
virFreeCallback freeFunc);
virNodeDevicePtr virGetNodeDevice(virConnectPtr conn,
const char *name);
virSecretPtr virGetSecret(virConnectPtr conn,
const unsigned char *uuid,
int usageType,
const char *usageID);
virStreamPtr virGetStream(virConnectPtr conn);
virNWFilterPtr virGetNWFilter(virConnectPtr conn,
const char *name,
const unsigned char *uuid);
virDomainSnapshotPtr virGetDomainSnapshot(virDomainPtr domain,
const char *name);
#endif /* __VIR_DATATYPES_H__ */