libvirt/src/libvirt-qemu.c

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/*
* libvirt-qemu.c: Interfaces for the libvirt library to handle qemu-specific
* APIs.
*
build: use correct type for pid and similar types No thanks to 64-bit windows, with 64-bit pid_t, we have to avoid constructs like 'int pid'. Our API in libvirt-qemu cannot be changed without breaking ABI; but then again, libvirt-qemu can only be used on systems that support UNIX sockets, which rules out Windows (even if qemu could be compiled there) - so for all points on the call chain that interact with this API decision, we require a different variable name to make it clear that we audited the use for safety. Adding a syntax-check rule only solves half the battle; anywhere that uses printf on a pid_t still needs to be converted, but that will be a separate patch. * cfg.mk (sc_correct_id_types): New syntax check. * src/libvirt-qemu.c (virDomainQemuAttach): Document why we didn't use pid_t for pid, and validate for overflow. * include/libvirt/libvirt-qemu.h (virDomainQemuAttach): Tweak name for syntax check. * src/vmware/vmware_conf.c (vmwareExtractPid): Likewise. * src/driver.h (virDrvDomainQemuAttach): Likewise. * tools/virsh.c (cmdQemuAttach): Likewise. * src/remote/qemu_protocol.x (qemu_domain_attach_args): Likewise. * src/qemu_protocol-structs (qemu_domain_attach_args): Likewise. * src/util/cgroup.c (virCgroupPidCode, virCgroupKillInternal): Likewise. * src/qemu/qemu_command.c(qemuParseProcFileStrings): Likewise. (qemuParseCommandLinePid): Use pid_t for pid. * daemon/libvirtd.c (daemonForkIntoBackground): Likewise. * src/conf/domain_conf.h (_virDomainObj): Likewise. * src/probes.d (rpc_socket_new): Likewise. * src/qemu/qemu_command.h (qemuParseCommandLinePid): Likewise. * src/qemu/qemu_driver.c (qemudGetProcessInfo, qemuDomainAttach): Likewise. * src/qemu/qemu_process.c (qemuProcessAttach): Likewise. * src/qemu/qemu_process.h (qemuProcessAttach): Likewise. * src/uml/uml_driver.c (umlGetProcessInfo): Likewise. * src/util/virnetdev.h (virNetDevSetNamespace): Likewise. * src/util/virnetdev.c (virNetDevSetNamespace): Likewise. * tests/testutils.c (virtTestCaptureProgramOutput): Likewise. * src/conf/storage_conf.h (_virStoragePerms): Use mode_t, uid_t, and gid_t rather than int. * src/security/security_dac.c (virSecurityDACSetOwnership): Likewise. * src/conf/storage_conf.c (virStorageDefParsePerms): Avoid compiler warning.
2012-02-10 23:08:11 +00:00
* Copyright (C) 2010-2012 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/>.
*
* Author: Chris Lalancette <clalance@redhat.com>
*/
#include <config.h>
#include "virerror.h"
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#include "virlog.h"
#include "datatypes.h"
#define VIR_FROM_THIS VIR_FROM_NONE
#define virLibConnError(conn, error, info) \
virReportErrorHelper(VIR_FROM_NONE, error, __FILE__, __FUNCTION__, \
__LINE__, info)
#define virLibDomainError(domain, error, info) \
virReportErrorHelper(VIR_FROM_DOM, error, __FILE__, __FUNCTION__, \
__LINE__, info)
/**
* virDomainQemuMonitorCommand:
* @domain: a domain object
* @cmd: the qemu monitor command string
* @result: a string returned by @cmd
* @flags: bitwise-or of supported virDomainQemuMonitorCommandFlags
*
* This API is QEMU specific, so it will only work with hypervisor
* connections to the QEMU driver.
*
* Send an arbitrary monitor command @cmd to @domain through the
* qemu monitor. There are several requirements to safely and
* successfully use this API:
*
* - A @cmd that queries state without making any modifications is safe
* - A @cmd that alters state that is also tracked by libvirt is unsafe,
* and may cause libvirtd to crash
* - A @cmd that alters state not tracked by the current version of
* libvirt is possible as a means to test new qemu features before
* they have support in libvirt, but no guarantees are made to safety
*
* If VIR_DOMAIN_QEMU_MONITOR_COMMAND_HMP is set, the command is
* considered to be a human monitor command and libvirt will automatically
* convert it into QMP if needed. In that case the @result will also
* be converted back from QMP.
*
* If successful, @result will be filled with the string output of the
* @cmd, and the caller must free this string.
*
* Returns 0 in case of success, -1 in case of failure
*
*/
int
virDomainQemuMonitorCommand(virDomainPtr domain, const char *cmd,
char **result, unsigned int flags)
{
virConnectPtr conn;
VIR_DEBUG("domain=%p, cmd=%s, result=%p, flags=%x",
domain, cmd, result, flags);
virResetLastError();
if (!VIR_IS_CONNECTED_DOMAIN(domain)) {
virLibDomainError(NULL, VIR_ERR_INVALID_DOMAIN, __FUNCTION__);
virDispatchError(NULL);
return -1;
}
conn = domain->conn;
virCheckNonNullArgGoto(result, error);
if (conn->flags & VIR_CONNECT_RO) {
virLibDomainError(domain, VIR_ERR_OPERATION_DENIED, __FUNCTION__);
goto error;
}
if (conn->driver->domainQemuMonitorCommand) {
int ret;
ret = conn->driver->domainQemuMonitorCommand(domain, cmd, result,
flags);
if (ret < 0)
goto error;
return ret;
}
virLibConnError(conn, VIR_ERR_NO_SUPPORT, __FUNCTION__);
error:
virDispatchError(conn);
return -1;
}
/**
* virDomainQemuAttach:
* @conn: pointer to a hypervisor connection
build: use correct type for pid and similar types No thanks to 64-bit windows, with 64-bit pid_t, we have to avoid constructs like 'int pid'. Our API in libvirt-qemu cannot be changed without breaking ABI; but then again, libvirt-qemu can only be used on systems that support UNIX sockets, which rules out Windows (even if qemu could be compiled there) - so for all points on the call chain that interact with this API decision, we require a different variable name to make it clear that we audited the use for safety. Adding a syntax-check rule only solves half the battle; anywhere that uses printf on a pid_t still needs to be converted, but that will be a separate patch. * cfg.mk (sc_correct_id_types): New syntax check. * src/libvirt-qemu.c (virDomainQemuAttach): Document why we didn't use pid_t for pid, and validate for overflow. * include/libvirt/libvirt-qemu.h (virDomainQemuAttach): Tweak name for syntax check. * src/vmware/vmware_conf.c (vmwareExtractPid): Likewise. * src/driver.h (virDrvDomainQemuAttach): Likewise. * tools/virsh.c (cmdQemuAttach): Likewise. * src/remote/qemu_protocol.x (qemu_domain_attach_args): Likewise. * src/qemu_protocol-structs (qemu_domain_attach_args): Likewise. * src/util/cgroup.c (virCgroupPidCode, virCgroupKillInternal): Likewise. * src/qemu/qemu_command.c(qemuParseProcFileStrings): Likewise. (qemuParseCommandLinePid): Use pid_t for pid. * daemon/libvirtd.c (daemonForkIntoBackground): Likewise. * src/conf/domain_conf.h (_virDomainObj): Likewise. * src/probes.d (rpc_socket_new): Likewise. * src/qemu/qemu_command.h (qemuParseCommandLinePid): Likewise. * src/qemu/qemu_driver.c (qemudGetProcessInfo, qemuDomainAttach): Likewise. * src/qemu/qemu_process.c (qemuProcessAttach): Likewise. * src/qemu/qemu_process.h (qemuProcessAttach): Likewise. * src/uml/uml_driver.c (umlGetProcessInfo): Likewise. * src/util/virnetdev.h (virNetDevSetNamespace): Likewise. * src/util/virnetdev.c (virNetDevSetNamespace): Likewise. * tests/testutils.c (virtTestCaptureProgramOutput): Likewise. * src/conf/storage_conf.h (_virStoragePerms): Use mode_t, uid_t, and gid_t rather than int. * src/security/security_dac.c (virSecurityDACSetOwnership): Likewise. * src/conf/storage_conf.c (virStorageDefParsePerms): Avoid compiler warning.
2012-02-10 23:08:11 +00:00
* @pid_value: the UNIX process ID of the external QEMU process
* @flags: optional flags, currently unused
*
* This API is QEMU specific, so it will only work with hypervisor
* connections to the QEMU driver.
*
* This API will attach to an externally launched QEMU process
* identified by @pid. There are several requirements to successfully
* attach to an external QEMU process:
*
* - It must have been started with a monitor socket using the UNIX
* domain socket protocol.
* - No device hotplug/unplug, or other configuration changes can
* have been made via the monitor since it started.
* - The '-name' and '-uuid' arguments should have been set (not
* mandatory, but strongly recommended)
*
build: use correct type for pid and similar types No thanks to 64-bit windows, with 64-bit pid_t, we have to avoid constructs like 'int pid'. Our API in libvirt-qemu cannot be changed without breaking ABI; but then again, libvirt-qemu can only be used on systems that support UNIX sockets, which rules out Windows (even if qemu could be compiled there) - so for all points on the call chain that interact with this API decision, we require a different variable name to make it clear that we audited the use for safety. Adding a syntax-check rule only solves half the battle; anywhere that uses printf on a pid_t still needs to be converted, but that will be a separate patch. * cfg.mk (sc_correct_id_types): New syntax check. * src/libvirt-qemu.c (virDomainQemuAttach): Document why we didn't use pid_t for pid, and validate for overflow. * include/libvirt/libvirt-qemu.h (virDomainQemuAttach): Tweak name for syntax check. * src/vmware/vmware_conf.c (vmwareExtractPid): Likewise. * src/driver.h (virDrvDomainQemuAttach): Likewise. * tools/virsh.c (cmdQemuAttach): Likewise. * src/remote/qemu_protocol.x (qemu_domain_attach_args): Likewise. * src/qemu_protocol-structs (qemu_domain_attach_args): Likewise. * src/util/cgroup.c (virCgroupPidCode, virCgroupKillInternal): Likewise. * src/qemu/qemu_command.c(qemuParseProcFileStrings): Likewise. (qemuParseCommandLinePid): Use pid_t for pid. * daemon/libvirtd.c (daemonForkIntoBackground): Likewise. * src/conf/domain_conf.h (_virDomainObj): Likewise. * src/probes.d (rpc_socket_new): Likewise. * src/qemu/qemu_command.h (qemuParseCommandLinePid): Likewise. * src/qemu/qemu_driver.c (qemudGetProcessInfo, qemuDomainAttach): Likewise. * src/qemu/qemu_process.c (qemuProcessAttach): Likewise. * src/qemu/qemu_process.h (qemuProcessAttach): Likewise. * src/uml/uml_driver.c (umlGetProcessInfo): Likewise. * src/util/virnetdev.h (virNetDevSetNamespace): Likewise. * src/util/virnetdev.c (virNetDevSetNamespace): Likewise. * tests/testutils.c (virtTestCaptureProgramOutput): Likewise. * src/conf/storage_conf.h (_virStoragePerms): Use mode_t, uid_t, and gid_t rather than int. * src/security/security_dac.c (virSecurityDACSetOwnership): Likewise. * src/conf/storage_conf.c (virStorageDefParsePerms): Avoid compiler warning.
2012-02-10 23:08:11 +00:00
* To date, the only platforms we know of where pid_t is larger than
* unsigned int (64-bit Windows) also lack UNIX sockets, so the choice
* of @pid_value as an unsigned int should not present any difficulties.
*
* If successful, then the guest will appear in the list of running
* domains for this connection, and other APIs should operate
* normally (provided the above requirements were honored).
*
* Returns a new domain object on success, NULL otherwise
*/
virDomainPtr
virDomainQemuAttach(virConnectPtr conn,
build: use correct type for pid and similar types No thanks to 64-bit windows, with 64-bit pid_t, we have to avoid constructs like 'int pid'. Our API in libvirt-qemu cannot be changed without breaking ABI; but then again, libvirt-qemu can only be used on systems that support UNIX sockets, which rules out Windows (even if qemu could be compiled there) - so for all points on the call chain that interact with this API decision, we require a different variable name to make it clear that we audited the use for safety. Adding a syntax-check rule only solves half the battle; anywhere that uses printf on a pid_t still needs to be converted, but that will be a separate patch. * cfg.mk (sc_correct_id_types): New syntax check. * src/libvirt-qemu.c (virDomainQemuAttach): Document why we didn't use pid_t for pid, and validate for overflow. * include/libvirt/libvirt-qemu.h (virDomainQemuAttach): Tweak name for syntax check. * src/vmware/vmware_conf.c (vmwareExtractPid): Likewise. * src/driver.h (virDrvDomainQemuAttach): Likewise. * tools/virsh.c (cmdQemuAttach): Likewise. * src/remote/qemu_protocol.x (qemu_domain_attach_args): Likewise. * src/qemu_protocol-structs (qemu_domain_attach_args): Likewise. * src/util/cgroup.c (virCgroupPidCode, virCgroupKillInternal): Likewise. * src/qemu/qemu_command.c(qemuParseProcFileStrings): Likewise. (qemuParseCommandLinePid): Use pid_t for pid. * daemon/libvirtd.c (daemonForkIntoBackground): Likewise. * src/conf/domain_conf.h (_virDomainObj): Likewise. * src/probes.d (rpc_socket_new): Likewise. * src/qemu/qemu_command.h (qemuParseCommandLinePid): Likewise. * src/qemu/qemu_driver.c (qemudGetProcessInfo, qemuDomainAttach): Likewise. * src/qemu/qemu_process.c (qemuProcessAttach): Likewise. * src/qemu/qemu_process.h (qemuProcessAttach): Likewise. * src/uml/uml_driver.c (umlGetProcessInfo): Likewise. * src/util/virnetdev.h (virNetDevSetNamespace): Likewise. * src/util/virnetdev.c (virNetDevSetNamespace): Likewise. * tests/testutils.c (virtTestCaptureProgramOutput): Likewise. * src/conf/storage_conf.h (_virStoragePerms): Use mode_t, uid_t, and gid_t rather than int. * src/security/security_dac.c (virSecurityDACSetOwnership): Likewise. * src/conf/storage_conf.c (virStorageDefParsePerms): Avoid compiler warning.
2012-02-10 23:08:11 +00:00
unsigned int pid_value,
unsigned int flags)
{
build: use correct type for pid and similar types No thanks to 64-bit windows, with 64-bit pid_t, we have to avoid constructs like 'int pid'. Our API in libvirt-qemu cannot be changed without breaking ABI; but then again, libvirt-qemu can only be used on systems that support UNIX sockets, which rules out Windows (even if qemu could be compiled there) - so for all points on the call chain that interact with this API decision, we require a different variable name to make it clear that we audited the use for safety. Adding a syntax-check rule only solves half the battle; anywhere that uses printf on a pid_t still needs to be converted, but that will be a separate patch. * cfg.mk (sc_correct_id_types): New syntax check. * src/libvirt-qemu.c (virDomainQemuAttach): Document why we didn't use pid_t for pid, and validate for overflow. * include/libvirt/libvirt-qemu.h (virDomainQemuAttach): Tweak name for syntax check. * src/vmware/vmware_conf.c (vmwareExtractPid): Likewise. * src/driver.h (virDrvDomainQemuAttach): Likewise. * tools/virsh.c (cmdQemuAttach): Likewise. * src/remote/qemu_protocol.x (qemu_domain_attach_args): Likewise. * src/qemu_protocol-structs (qemu_domain_attach_args): Likewise. * src/util/cgroup.c (virCgroupPidCode, virCgroupKillInternal): Likewise. * src/qemu/qemu_command.c(qemuParseProcFileStrings): Likewise. (qemuParseCommandLinePid): Use pid_t for pid. * daemon/libvirtd.c (daemonForkIntoBackground): Likewise. * src/conf/domain_conf.h (_virDomainObj): Likewise. * src/probes.d (rpc_socket_new): Likewise. * src/qemu/qemu_command.h (qemuParseCommandLinePid): Likewise. * src/qemu/qemu_driver.c (qemudGetProcessInfo, qemuDomainAttach): Likewise. * src/qemu/qemu_process.c (qemuProcessAttach): Likewise. * src/qemu/qemu_process.h (qemuProcessAttach): Likewise. * src/uml/uml_driver.c (umlGetProcessInfo): Likewise. * src/util/virnetdev.h (virNetDevSetNamespace): Likewise. * src/util/virnetdev.c (virNetDevSetNamespace): Likewise. * tests/testutils.c (virtTestCaptureProgramOutput): Likewise. * src/conf/storage_conf.h (_virStoragePerms): Use mode_t, uid_t, and gid_t rather than int. * src/security/security_dac.c (virSecurityDACSetOwnership): Likewise. * src/conf/storage_conf.c (virStorageDefParsePerms): Avoid compiler warning.
2012-02-10 23:08:11 +00:00
pid_t pid = pid_value;
VIR_DEBUG("conn=%p, pid=%u, flags=%x", conn, pid_value, flags);
virResetLastError();
if (!VIR_IS_CONNECT(conn)) {
virLibConnError(NULL, VIR_ERR_INVALID_CONN, __FUNCTION__);
virDispatchError(NULL);
return NULL;
}
virCheckPositiveArgGoto(pid_value, error);
if (pid != pid_value) {
virReportInvalidArg(pid_value,
_("pid_value in %s is too large"),
__FUNCTION__);
goto error;
}
if (conn->flags & VIR_CONNECT_RO) {
virLibDomainError(domain, VIR_ERR_OPERATION_DENIED, __FUNCTION__);
goto error;
}
if (conn->driver->domainQemuAttach) {
virDomainPtr ret;
ret = conn->driver->domainQemuAttach(conn, pid_value, flags);
if (!ret)
goto error;
return ret;
}
virLibConnError(conn, VIR_ERR_NO_SUPPORT, __FUNCTION__);
error:
virDispatchError(conn);
return NULL;
}
/**
* virDomainQemuAgentCommand:
* @domain: a domain object
* @cmd: the guest agent command string
* @timeout: timeout seconds
* @flags: execution flags
*
* Execute an arbitrary Guest Agent command.
*
* Issue @cmd to the guest agent running in @domain.
* @timeout must be -2, -1, 0 or positive.
* VIR_DOMAIN_QEMU_AGENT_COMMAND_BLOCK(-2): meaning to block forever waiting for
* a result.
* VIR_DOMAIN_QEMU_AGENT_COMMAND_DEFAULT(-1): use default timeout value.
* VIR_DOMAIN_QEMU_AGENT_COMMAND_NOWAIT(0): does not wait.
* positive value: wait for @timeout seconds
*
* Returns strings if success, NULL in failure.
*/
char *
virDomainQemuAgentCommand(virDomainPtr domain,
const char *cmd,
int timeout,
unsigned int flags)
{
virConnectPtr conn;
char *ret;
VIR_DEBUG("domain=%p, cmd=%s, timeout=%d, flags=%x",
domain, cmd, timeout, flags);
if (!VIR_IS_CONNECTED_DOMAIN(domain)) {
virLibDomainError(NULL, VIR_ERR_INVALID_DOMAIN, __FUNCTION__);
virDispatchError(NULL);
return NULL;
}
conn = domain->conn;
if (conn->flags & VIR_CONNECT_RO) {
virLibDomainError(NULL, VIR_ERR_OPERATION_DENIED, __FUNCTION__);
goto error;
}
if (conn->driver->domainQemuAgentCommand) {
ret = conn->driver->domainQemuAgentCommand(domain, cmd,
timeout, flags);
if (!ret)
goto error;
return ret;
}
virLibConnError(conn, VIR_ERR_NO_SUPPORT, __FUNCTION__);
/* Copy to connection error object for back compatibility */
error:
virDispatchError(conn);
return NULL;
}