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2086a9905a
libvirt/src/libvirt.c
Daniel P. Berrange 0399b188ac Move virConnect/virNode related APIs out of libvirt.c 
Introduce a src/libvirt-host.c file to hold all the
methods related to the virConnect type.
2014-10-24 16:59:58 +01:00

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/*
* libvirt.c: Main interfaces for the libvirt library to handle virtualization
* domains from a process running in domain 0
*
* Copyright (C) 2005-2006, 2008-2014 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/>.
*
* Daniel Veillard <veillard@redhat.com>
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/wait.h>
#include <time.h>
#include <libxml/parser.h>
#include <libxml/xpath.h>
#include "getpass.h"
#ifdef HAVE_WINSOCK2_H
# include <winsock2.h>
#endif
#ifdef WITH_CURL
# include <curl/curl.h>
#endif
#include "virerror.h"
#include "virlog.h"
#include "datatypes.h"
#include "driver.h"
#include "viruuid.h"
#include "viralloc.h"
#include "configmake.h"
#include "virconf.h"
#if WITH_GNUTLS
# if WITH_GNUTLS_GCRYPT
# include <gcrypt.h>
# endif
# include "rpc/virnettlscontext.h"
#endif
#include "vircommand.h"
#include "virfile.h"
#include "virrandom.h"
#include "viruri.h"
#include "virthread.h"
#include "virstring.h"
#include "virutil.h"
#include "virtypedparam.h"
#ifdef WITH_TEST
# include "test/test_driver.h"
#endif
#ifdef WITH_REMOTE
# include "remote/remote_driver.h"
#endif
#ifdef WITH_OPENVZ
# include "openvz/openvz_driver.h"
#endif
#ifdef WITH_VMWARE
# include "vmware/vmware_driver.h"
#endif
#ifdef WITH_PHYP
# include "phyp/phyp_driver.h"
#endif
#ifdef WITH_ESX
# include "esx/esx_driver.h"
#endif
#ifdef WITH_HYPERV
# include "hyperv/hyperv_driver.h"
#endif
#ifdef WITH_XENAPI
# include "xenapi/xenapi_driver.h"
#endif
#ifdef WITH_PARALLELS
# include "parallels/parallels_driver.h"
#endif
#ifdef WITH_BHYVE
# include "bhyve/bhyve_driver.h"
#endif
#define VIR_FROM_THIS VIR_FROM_NONE
VIR_LOG_INIT("libvirt");
/*
* TODO:
* - use lock to protect against concurrent accesses ?
* - use reference counting to guarantee coherent pointer state ?
*/
#define MAX_DRIVERS 20
#define virDriverCheckTabMaxReturn(count, ret) \
do { \
if ((count) >= MAX_DRIVERS) { \
virReportError(VIR_ERR_INTERNAL_ERROR, \
_("Too many drivers, cannot register %s"), \
driver->name); \
return ret; \
} \
} while (0)
static virHypervisorDriverPtr virHypervisorDriverTab[MAX_DRIVERS];
static int virHypervisorDriverTabCount = 0;
static virNetworkDriverPtr virNetworkDriverTab[MAX_DRIVERS];
static int virNetworkDriverTabCount = 0;
static virInterfaceDriverPtr virInterfaceDriverTab[MAX_DRIVERS];
static int virInterfaceDriverTabCount = 0;
static virStorageDriverPtr virStorageDriverTab[MAX_DRIVERS];
static int virStorageDriverTabCount = 0;
static virNodeDeviceDriverPtr virNodeDeviceDriverTab[MAX_DRIVERS];
static int virNodeDeviceDriverTabCount = 0;
static virSecretDriverPtr virSecretDriverTab[MAX_DRIVERS];
static int virSecretDriverTabCount = 0;
static virNWFilterDriverPtr virNWFilterDriverTab[MAX_DRIVERS];
static int virNWFilterDriverTabCount = 0;
#ifdef WITH_LIBVIRTD
static virStateDriverPtr virStateDriverTab[MAX_DRIVERS];
static int virStateDriverTabCount = 0;
#endif
#if defined(POLKIT_AUTH)
static int
virConnectAuthGainPolkit(const char *privilege)
{
virCommandPtr cmd;
int ret = -1;
if (geteuid() == 0)
return 0;
cmd = virCommandNewArgList(POLKIT_AUTH, "--obtain", privilege, NULL);
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
ret = 0;
cleanup:
virCommandFree(cmd);
return ret;
}
#endif
static int
virConnectAuthCallbackDefault(virConnectCredentialPtr cred,
unsigned int ncred,
void *cbdata ATTRIBUTE_UNUSED)
{
size_t i;
for (i = 0; i < ncred; i++) {
char buf[1024];
char *bufptr = buf;
size_t len;
switch (cred[i].type) {
case VIR_CRED_EXTERNAL: {
if (STRNEQ(cred[i].challenge, "PolicyKit"))
return -1;
#if defined(POLKIT_AUTH)
if (virConnectAuthGainPolkit(cred[i].prompt) < 0)
return -1;
#else
/*
* Ignore & carry on. Although we can't auth
* directly, the user may have authenticated
* themselves already outside context of libvirt
*/
#endif
break;
}
case VIR_CRED_USERNAME:
case VIR_CRED_AUTHNAME:
case VIR_CRED_ECHOPROMPT:
case VIR_CRED_REALM:
if (printf("%s: ", cred[i].prompt) < 0)
return -1;
if (fflush(stdout) != 0)
return -1;
if (!fgets(buf, sizeof(buf), stdin)) {
if (feof(stdin)) { /* Treat EOF as "" */
buf[0] = '\0';
break;
}
return -1;
}
len = strlen(buf);
if (len != 0 && buf[len-1] == '\n')
buf[len-1] = '\0';
break;
case VIR_CRED_PASSPHRASE:
case VIR_CRED_NOECHOPROMPT:
if (printf("%s: ", cred[i].prompt) < 0)
return -1;
if (fflush(stdout) != 0)
return -1;
bufptr = getpass("");
if (!bufptr)
return -1;
break;
default:
return -1;
}
if (cred[i].type != VIR_CRED_EXTERNAL) {
if (VIR_STRDUP(cred[i].result,
STREQ(bufptr, "") && cred[i].defresult ?
cred[i].defresult : bufptr) < 0)
return -1;
cred[i].resultlen = strlen(cred[i].result);
}
}
return 0;
}
/* Don't typically want VIR_CRED_USERNAME. It enables you to authenticate
* as one user, and act as another. It just results in annoying
* prompts for the username twice & is very rarely what you want
*/
static int virConnectCredTypeDefault[] = {
VIR_CRED_AUTHNAME,
VIR_CRED_ECHOPROMPT,
VIR_CRED_REALM,
VIR_CRED_PASSPHRASE,
VIR_CRED_NOECHOPROMPT,
VIR_CRED_EXTERNAL,
};
static virConnectAuth virConnectAuthDefault = {
virConnectCredTypeDefault,
sizeof(virConnectCredTypeDefault)/sizeof(int),
virConnectAuthCallbackDefault,
NULL,
};
/*
* virConnectAuthPtrDefault
*
* A default implementation of the authentication callbacks. This
* implementation is suitable for command line based tools. It will
* prompt for username, passwords, realm and one time keys as needed.
* It will print on STDOUT, and read from STDIN. If this is not
* suitable for the application's needs an alternative implementation
* should be provided.
*/
virConnectAuthPtr virConnectAuthPtrDefault = &virConnectAuthDefault;
#if HAVE_WINSOCK2_H
static int
winsock_init(void)
{
WORD winsock_version, err;
WSADATA winsock_data;
/* http://msdn2.microsoft.com/en-us/library/ms742213.aspx */
winsock_version = MAKEWORD (2, 2);
err = WSAStartup (winsock_version, &winsock_data);
return err == 0 ? 0 : -1;
}
#endif
#ifdef WITH_GNUTLS_GCRYPT
static int
virTLSMutexInit(void **priv)
{
virMutexPtr lock = NULL;
if (VIR_ALLOC_QUIET(lock) < 0)
return ENOMEM;
if (virMutexInit(lock) < 0) {
VIR_FREE(lock);
return errno;
}
*priv = lock;
return 0;
}
static int
virTLSMutexDestroy(void **priv)
{
virMutexPtr lock = *priv;
virMutexDestroy(lock);
VIR_FREE(lock);
return 0;
}
static int
virTLSMutexLock(void **priv)
{
virMutexPtr lock = *priv;
virMutexLock(lock);
return 0;
}
static int
virTLSMutexUnlock(void **priv)
{
virMutexPtr lock = *priv;
virMutexUnlock(lock);
return 0;
}
static struct gcry_thread_cbs virTLSThreadImpl = {
/* GCRY_THREAD_OPTION_VERSION was added in gcrypt 1.4.2 */
# ifdef GCRY_THREAD_OPTION_VERSION
(GCRY_THREAD_OPTION_PTHREAD | (GCRY_THREAD_OPTION_VERSION << 8)),
# else
GCRY_THREAD_OPTION_PTHREAD,
# endif
NULL,
virTLSMutexInit,
virTLSMutexDestroy,
virTLSMutexLock,
virTLSMutexUnlock,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};
#endif /* WITH_GNUTLS_GCRYPT */
static bool virGlobalError = false;
static virOnceControl virGlobalOnce = VIR_ONCE_CONTROL_INITIALIZER;
static void
virGlobalInit(void)
{
/* It would be nice if we could trace the use of this call, to
* help diagnose in log files if a user calls something other than
* virConnectOpen first. But we can't rely on VIR_DEBUG working
* until after initialization is complete, and since this is
* one-shot, we never get here again. */
if (virThreadInitialize() < 0 ||
virErrorInitialize() < 0)
goto error;
#ifndef LIBVIRT_SETUID_RPC_CLIENT
if (virIsSUID()) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("libvirt.so is not safe to use from setuid programs"));
goto error;
}
#endif
#ifdef WITH_GNUTLS_GCRYPT
/*
* This sequence of API calls it copied exactly from
* gnutls 2.12.23 source lib/gcrypt/init.c, with
* exception that GCRYCTL_ENABLE_QUICK_RANDOM, is
* dropped
*/
if (gcry_control(GCRYCTL_ANY_INITIALIZATION_P) == 0) {
gcry_control(GCRYCTL_SET_THREAD_CBS, &virTLSThreadImpl);
gcry_check_version(NULL);
gcry_control(GCRYCTL_DISABLE_SECMEM, NULL, 0);
gcry_control(GCRYCTL_INITIALIZATION_FINISHED, NULL, 0);
}
#endif
virLogSetFromEnv();
#ifdef WITH_GNUTLS
virNetTLSInit();
#endif
#if WITH_CURL
curl_global_init(CURL_GLOBAL_DEFAULT);
#endif
VIR_DEBUG("register drivers");
#if HAVE_WINSOCK2_H
if (winsock_init() == -1)
goto error;
#endif
if (!bindtextdomain(PACKAGE, LOCALEDIR))
goto error;
/*
* Note we must avoid everything except 'remote' driver
* for virt-login-shell usage
*/
#ifndef LIBVIRT_SETUID_RPC_CLIENT
/*
* Note that the order is important: the first ones have a higher
* priority when calling virConnectOpen.
*/
# ifdef WITH_TEST
if (testRegister() == -1)
goto error;
# endif
# ifdef WITH_OPENVZ
if (openvzRegister() == -1)
goto error;
# endif
# ifdef WITH_VMWARE
if (vmwareRegister() == -1)
goto error;
# endif
# ifdef WITH_PHYP
if (phypRegister() == -1)
goto error;
# endif
# ifdef WITH_ESX
if (esxRegister() == -1)
goto error;
# endif
# ifdef WITH_HYPERV
if (hypervRegister() == -1)
goto error;
# endif
# ifdef WITH_XENAPI
if (xenapiRegister() == -1)
goto error;
# endif
# ifdef WITH_PARALLELS
if (parallelsRegister() == -1)
goto error;
# endif
#endif
#ifdef WITH_REMOTE
if (remoteRegister() == -1)
goto error;
#endif
return;
error:
virGlobalError = true;
}
/**
* virInitialize:
*
* Initialize the library.
*
* This method is invoked automatically by any of the virConnectOpen() API
* calls, and by virGetVersion(). Since release 1.0.0, there is no need to
* call this method even in a multithreaded application, since
* initialization is performed in a thread safe manner; but applications
* using an older version of the library should manually call this before
* setting up competing threads that attempt virConnectOpen in parallel.
*
* The only other time it would be necessary to call virInitialize is if the
* application did not invoke virConnectOpen as its first API call, such
* as when calling virEventRegisterImpl() before setting up connections,
* or when using virSetErrorFunc() to alter error reporting of the first
* connection attempt.
*
* Returns 0 in case of success, -1 in case of error
*/
int
virInitialize(void)
{
if (virOnce(&virGlobalOnce, virGlobalInit) < 0)
return -1;
if (virGlobalError)
return -1;
return 0;
}
#ifdef WIN32
BOOL WINAPI
DllMain(HINSTANCE instance, DWORD reason, LPVOID ignore);
BOOL WINAPI
DllMain(HINSTANCE instance ATTRIBUTE_UNUSED,
DWORD reason,
LPVOID ignore ATTRIBUTE_UNUSED)
{
switch (reason) {
case DLL_PROCESS_ATTACH:
virInitialize();
break;
case DLL_THREAD_ATTACH:
/* Nothing todo in libvirt yet */
break;
case DLL_THREAD_DETACH:
/* Release per-thread local data */
virThreadOnExit();
break;
case DLL_PROCESS_DETACH:
/* Don't bother releasing per-thread data
since (hopefully) windows cleans up
everything on process exit */
break;
}
return TRUE;
}
#endif
/**
* virRegisterNetworkDriver:
* @driver: pointer to a network driver block
*
* Register a network virtualization driver
*
* Returns the driver priority or -1 in case of error.
*/
int
virRegisterNetworkDriver(virNetworkDriverPtr driver)
{
virCheckNonNullArgReturn(driver, -1);
virDriverCheckTabMaxReturn(virNetworkDriverTabCount, -1);
VIR_DEBUG("registering %s as network driver %d",
driver->name, virNetworkDriverTabCount);
virNetworkDriverTab[virNetworkDriverTabCount] = driver;
return virNetworkDriverTabCount++;
}
/**
* virRegisterInterfaceDriver:
* @driver: pointer to an interface driver block
*
* Register an interface virtualization driver
*
* Returns the driver priority or -1 in case of error.
*/
int
virRegisterInterfaceDriver(virInterfaceDriverPtr driver)
{
virCheckNonNullArgReturn(driver, -1);
virDriverCheckTabMaxReturn(virInterfaceDriverTabCount, -1);
VIR_DEBUG("registering %s as interface driver %d",
driver->name, virInterfaceDriverTabCount);
virInterfaceDriverTab[virInterfaceDriverTabCount] = driver;
return virInterfaceDriverTabCount++;
}
/**
* virRegisterStorageDriver:
* @driver: pointer to a storage driver block
*
* Register a storage virtualization driver
*
* Returns the driver priority or -1 in case of error.
*/
int
virRegisterStorageDriver(virStorageDriverPtr driver)
{
virCheckNonNullArgReturn(driver, -1);
virDriverCheckTabMaxReturn(virStorageDriverTabCount, -1);
VIR_DEBUG("registering %s as storage driver %d",
driver->name, virStorageDriverTabCount);
virStorageDriverTab[virStorageDriverTabCount] = driver;
return virStorageDriverTabCount++;
}
/**
* virRegisterNodeDeviceDriver:
* @driver: pointer to a device monitor block
*
* Register a device monitor
*
* Returns the driver priority or -1 in case of error.
*/
int
virRegisterNodeDeviceDriver(virNodeDeviceDriverPtr driver)
{
virCheckNonNullArgReturn(driver, -1);
virDriverCheckTabMaxReturn(virNodeDeviceDriverTabCount, -1);
VIR_DEBUG("registering %s as device driver %d",
driver->name, virNodeDeviceDriverTabCount);
virNodeDeviceDriverTab[virNodeDeviceDriverTabCount] = driver;
return virNodeDeviceDriverTabCount++;
}
/**
* virRegisterSecretDriver:
* @driver: pointer to a secret driver block
*
* Register a secret driver
*
* Returns the driver priority or -1 in case of error.
*/
int
virRegisterSecretDriver(virSecretDriverPtr driver)
{
virCheckNonNullArgReturn(driver, -1);
virDriverCheckTabMaxReturn(virSecretDriverTabCount, -1);
VIR_DEBUG("registering %s as secret driver %d",
driver->name, virSecretDriverTabCount);
virSecretDriverTab[virSecretDriverTabCount] = driver;
return virSecretDriverTabCount++;
}
/**
* virRegisterNWFilterDriver:
* @driver: pointer to a network filter driver block
*
* Register a network filter virtualization driver
*
* Returns the driver priority or -1 in case of error.
*/
int
virRegisterNWFilterDriver(virNWFilterDriverPtr driver)
{
virCheckNonNullArgReturn(driver, -1);
virDriverCheckTabMaxReturn(virNWFilterDriverTabCount, -1);
VIR_DEBUG("registering %s as network filter driver %d",
driver->name, virNWFilterDriverTabCount);
virNWFilterDriverTab[virNWFilterDriverTabCount] = driver;
return virNWFilterDriverTabCount++;
}
/**
* virRegisterHypervisorDriver:
* @driver: pointer to a driver block
*
* Register a virtualization driver
*
* Returns the driver priority or -1 in case of error.
*/
int
virRegisterHypervisorDriver(virHypervisorDriverPtr driver)
{
VIR_DEBUG("driver=%p name=%s", driver,
driver ? NULLSTR(driver->name) : "(null)");
virCheckNonNullArgReturn(driver, -1);
virDriverCheckTabMaxReturn(virHypervisorDriverTabCount, -1);
VIR_DEBUG("registering %s as driver %d",
driver->name, virHypervisorDriverTabCount);
virHypervisorDriverTab[virHypervisorDriverTabCount] = driver;
return virHypervisorDriverTabCount++;
}
#ifdef WITH_LIBVIRTD
/**
* virRegisterStateDriver:
* @driver: pointer to a driver block
*
* Register a virtualization driver
*
* Returns the driver priority or -1 in case of error.
*/
int
virRegisterStateDriver(virStateDriverPtr driver)
{
virCheckNonNullArgReturn(driver, -1);
virDriverCheckTabMaxReturn(virStateDriverTabCount, -1);
virStateDriverTab[virStateDriverTabCount] = driver;
return virStateDriverTabCount++;
}
/**
* virStateInitialize:
* @privileged: set to true if running with root privilege, false otherwise
* @callback: callback to invoke to inhibit shutdown of the daemon
* @opaque: data to pass to @callback
*
* Initialize all virtualization drivers. Accomplished in two phases,
* the first being state and structure initialization followed by any
* auto start supported by the driver. This is done to ensure dependencies
* that some drivers may have on another driver having been initialized
* will exist, such as the storage driver's need to use the secret driver.
*
* Returns 0 if all succeed, -1 upon any failure.
*/
int
virStateInitialize(bool privileged,
virStateInhibitCallback callback,
void *opaque)
{
size_t i;
if (virInitialize() < 0)
return -1;
for (i = 0; i < virStateDriverTabCount; i++) {
if (virStateDriverTab[i]->stateInitialize) {
VIR_DEBUG("Running global init for %s state driver",
virStateDriverTab[i]->name);
if (virStateDriverTab[i]->stateInitialize(privileged,
callback,
opaque) < 0) {
virErrorPtr err = virGetLastError();
VIR_ERROR(_("Initialization of %s state driver failed: %s"),
virStateDriverTab[i]->name,
err && err->message ? err->message : _("Unknown problem"));
return -1;
}
}
}
for (i = 0; i < virStateDriverTabCount; i++) {
if (virStateDriverTab[i]->stateAutoStart) {
VIR_DEBUG("Running global auto start for %s state driver",
virStateDriverTab[i]->name);
virStateDriverTab[i]->stateAutoStart();
}
}
return 0;
}
/**
* virStateCleanup:
*
* Run each virtualization driver's cleanup method.
*
* Returns 0 if all succeed, -1 upon any failure.
*/
int
virStateCleanup(void)
{
size_t i;
int ret = 0;
for (i = 0; i < virStateDriverTabCount; i++) {
if (virStateDriverTab[i]->stateCleanup &&
virStateDriverTab[i]->stateCleanup() < 0)
ret = -1;
}
return ret;
}
/**
* virStateReload:
*
* Run each virtualization driver's reload method.
*
* Returns 0 if all succeed, -1 upon any failure.
*/
int
virStateReload(void)
{
size_t i;
int ret = 0;
for (i = 0; i < virStateDriverTabCount; i++) {
if (virStateDriverTab[i]->stateReload &&
virStateDriverTab[i]->stateReload() < 0)
ret = -1;
}
return ret;
}
/**
* virStateStop:
*
* Run each virtualization driver's "stop" method.
*
* Returns 0 if successful, -1 on failure
*/
int
virStateStop(void)
{
size_t i;
int ret = 0;
for (i = 0; i < virStateDriverTabCount; i++) {
if (virStateDriverTab[i]->stateStop &&
virStateDriverTab[i]->stateStop())
ret = 1;
}
return ret;
}
#endif /* WITH_LIBVIRTD */
/**
* virGetVersion:
* @libVer: return value for the library version (OUT)
* @type: ignored; pass NULL
* @typeVer: pass NULL; for historical purposes duplicates @libVer if
* non-NULL
*
* Provides version information. @libVer is the version of the
* library and will always be set unless an error occurs, in which case
* an error code will be returned. @typeVer exists for historical
* compatibility; if it is not NULL it will duplicate @libVer (it was
* originally intended to return hypervisor information based on @type,
* but due to the design of remote clients this is not reliable). To
* get the version of the running hypervisor use the virConnectGetVersion()
* function instead. To get the libvirt library version used by a
* connection use the virConnectGetLibVersion() instead.
*
* This function includes a call to virInitialize() when necessary.
*
* Returns -1 in case of failure, 0 otherwise, and values for @libVer and
* @typeVer have the format major * 1,000,000 + minor * 1,000 + release.
*/
int
virGetVersion(unsigned long *libVer, const char *type ATTRIBUTE_UNUSED,
unsigned long *typeVer)
{
if (virInitialize() < 0)
goto error;
VIR_DEBUG("libVir=%p, type=%s, typeVer=%p", libVer, type, typeVer);
virResetLastError();
if (libVer == NULL)
goto error;
*libVer = LIBVIR_VERSION_NUMBER;
if (typeVer != NULL)
*typeVer = LIBVIR_VERSION_NUMBER;
return 0;
error:
virDispatchError(NULL);
return -1;
}
static char *
virConnectGetConfigFilePath(void)
{
char *path;
if (geteuid() == 0) {
if (virAsprintf(&path, "%s/libvirt/libvirt.conf",
SYSCONFDIR) < 0)
return NULL;
} else {
char *userdir = virGetUserConfigDirectory();
if (!userdir)
return NULL;
if (virAsprintf(&path, "%s/libvirt.conf",
userdir) < 0) {
VIR_FREE(userdir);
return NULL;
}
VIR_FREE(userdir);
}
return path;
}
static int
virConnectGetConfigFile(virConfPtr *conf)
{
char *filename = NULL;
int ret = -1;
*conf = NULL;
if (!(filename = virConnectGetConfigFilePath()))
goto cleanup;
if (!virFileExists(filename)) {
ret = 0;
goto cleanup;
}
VIR_DEBUG("Loading config file '%s'", filename);
if (!(*conf = virConfReadFile(filename, 0)))
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(filename);
return ret;
}
#define URI_ALIAS_CHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-"
static int
virConnectOpenFindURIAliasMatch(virConfValuePtr value, const char *alias,
char **uri)
{
virConfValuePtr entry;
size_t alias_len;
if (value->type != VIR_CONF_LIST) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Expected a list for 'uri_aliases' config parameter"));
return -1;
}
entry = value->list;
alias_len = strlen(alias);
while (entry) {
char *offset;
size_t safe;
if (entry->type != VIR_CONF_STRING) {
virReportError(VIR_ERR_CONF_SYNTAX, "%s",
_("Expected a string for 'uri_aliases' config parameter list entry"));
return -1;
}
if (!(offset = strchr(entry->str, '='))) {
virReportError(VIR_ERR_CONF_SYNTAX,
_("Malformed 'uri_aliases' config entry '%s', expected 'alias=uri://host/path'"),
entry->str);
return -1;
}
safe = strspn(entry->str, URI_ALIAS_CHARS);
if (safe < (offset - entry->str)) {
virReportError(VIR_ERR_CONF_SYNTAX,
_("Malformed 'uri_aliases' config entry '%s', aliases may only contain 'a-Z, 0-9, _, -'"),
entry->str);
return -1;
}
if (alias_len == (offset - entry->str) &&
STREQLEN(entry->str, alias, alias_len)) {
VIR_DEBUG("Resolved alias '%s' to '%s'",
alias, offset+1);
return VIR_STRDUP(*uri, offset+1);
}
entry = entry->next;
}
VIR_DEBUG("No alias found for '%s', passing through to drivers",
alias);
return 0;
}
static int
virConnectOpenResolveURIAlias(virConfPtr conf,
const char *alias, char **uri)
{
int ret = -1;
virConfValuePtr value = NULL;
*uri = NULL;
if ((value = virConfGetValue(conf, "uri_aliases")))
ret = virConnectOpenFindURIAliasMatch(value, alias, uri);
else
ret = 0;
return ret;
}
static int
virConnectGetDefaultURI(virConfPtr conf,
const char **name)
{
int ret = -1;
virConfValuePtr value = NULL;
const char *defname = virGetEnvBlockSUID("LIBVIRT_DEFAULT_URI");
if (defname && *defname) {
VIR_DEBUG("Using LIBVIRT_DEFAULT_URI '%s'", defname);
*name = defname;
} else if ((value = virConfGetValue(conf, "uri_default"))) {
if (value->type != VIR_CONF_STRING) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Expected a string for 'uri_default' config parameter"));
goto cleanup;
}
VIR_DEBUG("Using config file uri '%s'", value->str);
*name = value->str;
}
ret = 0;
cleanup:
return ret;
}
static virConnectPtr
do_open(const char *name,
virConnectAuthPtr auth,
unsigned int flags)
{
size_t i;
int res;
virConnectPtr ret;
virConfPtr conf = NULL;
ret = virGetConnect();
if (ret == NULL)
return NULL;
if (virConnectGetConfigFile(&conf) < 0)
goto failed;
if (name && name[0] == '\0')
name = NULL;
if (!name && virIsSUID()) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("An explicit URI must be provided when setuid"));
goto failed;
}
/*
* If no URI is passed, then check for an environment string if not
* available probe the compiled in drivers to find a default hypervisor
* if detectable.
*/
if (!name &&
virConnectGetDefaultURI(conf, &name) < 0)
goto failed;
if (name) {
char *alias = NULL;
/* Convert xen -> xen:/// for back compat */
if (STRCASEEQ(name, "xen"))
name = "xen:///";
/* Convert xen:// -> xen:/// because xmlParseURI cannot parse the
* former. This allows URIs such as xen://localhost to work.
*/
if (STREQ(name, "xen://"))
name = "xen:///";
if (!(flags & VIR_CONNECT_NO_ALIASES) &&
virConnectOpenResolveURIAlias(conf, name, &alias) < 0)
goto failed;
if (!(ret->uri = virURIParse(alias ? alias : name))) {
VIR_FREE(alias);
goto failed;
}
VIR_DEBUG("name \"%s\" to URI components:\n"
" scheme %s\n"
" server %s\n"
" user %s\n"
" port %d\n"
" path %s\n",
alias ? alias : name,
NULLSTR(ret->uri->scheme), NULLSTR(ret->uri->server),
NULLSTR(ret->uri->user), ret->uri->port,
NULLSTR(ret->uri->path));
VIR_FREE(alias);
} else {
VIR_DEBUG("no name, allowing driver auto-select");
}
/* Cleansing flags */
ret->flags = flags & VIR_CONNECT_RO;
for (i = 0; i < virHypervisorDriverTabCount; i++) {
/* We're going to probe the remote driver next. So we have already
* probed all other client-side-only driver before, but none of them
* accepted the URI.
* If the scheme corresponds to a known but disabled client-side-only
* driver then report a useful error, instead of a cryptic one about
* not being able to connect to libvirtd or not being able to find
* certificates. */
if (virHypervisorDriverTab[i]->no == VIR_DRV_REMOTE &&
ret->uri != NULL && ret->uri->scheme != NULL &&
(
#ifndef WITH_PHYP
STRCASEEQ(ret->uri->scheme, "phyp") ||
#endif
#ifndef WITH_ESX
STRCASEEQ(ret->uri->scheme, "vpx") ||
STRCASEEQ(ret->uri->scheme, "esx") ||
STRCASEEQ(ret->uri->scheme, "gsx") ||
#endif
#ifndef WITH_HYPERV
STRCASEEQ(ret->uri->scheme, "hyperv") ||
#endif
#ifndef WITH_XENAPI
STRCASEEQ(ret->uri->scheme, "xenapi") ||
#endif
#ifndef WITH_PARALLELS
STRCASEEQ(ret->uri->scheme, "parallels") ||
#endif
false)) {
virReportErrorHelper(VIR_FROM_NONE, VIR_ERR_CONFIG_UNSUPPORTED,
__FILE__, __FUNCTION__, __LINE__,
_("libvirt was built without the '%s' driver"),
ret->uri->scheme);
goto failed;
}
VIR_DEBUG("trying driver %zu (%s) ...", i, virHypervisorDriverTab[i]->name);
ret->driver = virHypervisorDriverTab[i];
res = virHypervisorDriverTab[i]->connectOpen(ret, auth, flags);
VIR_DEBUG("driver %zu %s returned %s",
i, virHypervisorDriverTab[i]->name,
res == VIR_DRV_OPEN_SUCCESS ? "SUCCESS" :
(res == VIR_DRV_OPEN_DECLINED ? "DECLINED" :
(res == VIR_DRV_OPEN_ERROR ? "ERROR" : "unknown status")));
if (res == VIR_DRV_OPEN_SUCCESS) {
break;
} else if (res == VIR_DRV_OPEN_ERROR) {
ret->driver = NULL;
goto failed;
} else {
ret->driver = NULL;
}
}
if (!ret->driver) {
/* If we reach here, then all drivers declined the connection. */
virReportError(VIR_ERR_NO_CONNECT, "%s", NULLSTR(name));
goto failed;
}
for (i = 0; i < virNetworkDriverTabCount; i++) {
res = virNetworkDriverTab[i]->networkOpen(ret, auth, flags);
VIR_DEBUG("network driver %zu %s returned %s",
i, virNetworkDriverTab[i]->name,
res == VIR_DRV_OPEN_SUCCESS ? "SUCCESS" :
(res == VIR_DRV_OPEN_DECLINED ? "DECLINED" :
(res == VIR_DRV_OPEN_ERROR ? "ERROR" : "unknown status")));
if (res == VIR_DRV_OPEN_SUCCESS) {
ret->networkDriver = virNetworkDriverTab[i];
break;
} else if (res == VIR_DRV_OPEN_ERROR) {
break;
}
}
for (i = 0; i < virInterfaceDriverTabCount; i++) {
res = virInterfaceDriverTab[i]->interfaceOpen(ret, auth, flags);
VIR_DEBUG("interface driver %zu %s returned %s",
i, virInterfaceDriverTab[i]->name,
res == VIR_DRV_OPEN_SUCCESS ? "SUCCESS" :
(res == VIR_DRV_OPEN_DECLINED ? "DECLINED" :
(res == VIR_DRV_OPEN_ERROR ? "ERROR" : "unknown status")));
if (res == VIR_DRV_OPEN_SUCCESS) {
ret->interfaceDriver = virInterfaceDriverTab[i];
break;
} else if (res == VIR_DRV_OPEN_ERROR) {
break;
}
}
/* Secondary driver for storage. Optional */
for (i = 0; i < virStorageDriverTabCount; i++) {
res = virStorageDriverTab[i]->storageOpen(ret, auth, flags);
VIR_DEBUG("storage driver %zu %s returned %s",
i, virStorageDriverTab[i]->name,
res == VIR_DRV_OPEN_SUCCESS ? "SUCCESS" :
(res == VIR_DRV_OPEN_DECLINED ? "DECLINED" :
(res == VIR_DRV_OPEN_ERROR ? "ERROR" : "unknown status")));
if (res == VIR_DRV_OPEN_SUCCESS) {
ret->storageDriver = virStorageDriverTab[i];
break;
} else if (res == VIR_DRV_OPEN_ERROR) {
break;
}
}
/* Node driver (optional) */
for (i = 0; i < virNodeDeviceDriverTabCount; i++) {
res = virNodeDeviceDriverTab[i]->nodeDeviceOpen(ret, auth, flags);
VIR_DEBUG("node driver %zu %s returned %s",
i, virNodeDeviceDriverTab[i]->name,
res == VIR_DRV_OPEN_SUCCESS ? "SUCCESS" :
(res == VIR_DRV_OPEN_DECLINED ? "DECLINED" :
(res == VIR_DRV_OPEN_ERROR ? "ERROR" : "unknown status")));
if (res == VIR_DRV_OPEN_SUCCESS) {
ret->nodeDeviceDriver = virNodeDeviceDriverTab[i];
break;
} else if (res == VIR_DRV_OPEN_ERROR) {
break;
}
}
/* Secret manipulation driver. Optional */
for (i = 0; i < virSecretDriverTabCount; i++) {
res = virSecretDriverTab[i]->secretOpen(ret, auth, flags);
VIR_DEBUG("secret driver %zu %s returned %s",
i, virSecretDriverTab[i]->name,
res == VIR_DRV_OPEN_SUCCESS ? "SUCCESS" :
(res == VIR_DRV_OPEN_DECLINED ? "DECLINED" :
(res == VIR_DRV_OPEN_ERROR ? "ERROR" : "unknown status")));
if (res == VIR_DRV_OPEN_SUCCESS) {
ret->secretDriver = virSecretDriverTab[i];
break;
} else if (res == VIR_DRV_OPEN_ERROR) {
break;
}
}
/* Network filter driver. Optional */
for (i = 0; i < virNWFilterDriverTabCount; i++) {
res = virNWFilterDriverTab[i]->nwfilterOpen(ret, auth, flags);
VIR_DEBUG("nwfilter driver %zu %s returned %s",
i, virNWFilterDriverTab[i]->name,
res == VIR_DRV_OPEN_SUCCESS ? "SUCCESS" :
(res == VIR_DRV_OPEN_DECLINED ? "DECLINED" :
(res == VIR_DRV_OPEN_ERROR ? "ERROR" : "unknown status")));
if (res == VIR_DRV_OPEN_SUCCESS) {
ret->nwfilterDriver = virNWFilterDriverTab[i];
break;
} else if (res == VIR_DRV_OPEN_ERROR) {
break;
}
}
virConfFree(conf);
return ret;
failed:
virConfFree(conf);
virObjectUnref(ret);
return NULL;
}
/**
* virConnectOpen:
* @name: (optional) URI of the hypervisor
*
* This function should be called first to get a connection to the
* Hypervisor and xen store
*
* If @name is NULL, if the LIBVIRT_DEFAULT_URI environment variable is set,
* then it will be used. Otherwise if the client configuration file
* has the "uri_default" parameter set, then it will be used. Finally
* probing will be done to determine a suitable default driver to activate.
* This involves trying each hypervisor in turn until one successfully opens.
*
* If connecting to an unprivileged hypervisor driver which requires
* the libvirtd daemon to be active, it will automatically be launched
* if not already running. This can be prevented by setting the
* environment variable LIBVIRT_AUTOSTART=0
*
* URIs are documented at http://libvirt.org/uri.html
*
* virConnectClose should be used to release the resources after the connection
* is no longer needed.
*
* Returns a pointer to the hypervisor connection or NULL in case of error
*/
virConnectPtr
virConnectOpen(const char *name)
{
virConnectPtr ret = NULL;
if (virInitialize() < 0)
goto error;
VIR_DEBUG("name=%s", NULLSTR(name));
virResetLastError();
ret = do_open(name, NULL, 0);
if (!ret)
goto error;
return ret;
error:
virDispatchError(NULL);
return NULL;
}
/**
* virConnectOpenReadOnly:
* @name: (optional) URI of the hypervisor
*
* This function should be called first to get a restricted connection to the
* library functionalities. The set of APIs usable are then restricted
* on the available methods to control the domains.
*
* See virConnectOpen for notes about environment variables which can
* have an effect on opening drivers and freeing the connection resources
*
* URIs are documented at http://libvirt.org/uri.html
*
* Returns a pointer to the hypervisor connection or NULL in case of error
*/
virConnectPtr
virConnectOpenReadOnly(const char *name)
{
virConnectPtr ret = NULL;
if (virInitialize() < 0)
goto error;
VIR_DEBUG("name=%s", NULLSTR(name));
virResetLastError();
ret = do_open(name, NULL, VIR_CONNECT_RO);
if (!ret)
goto error;
return ret;
error:
virDispatchError(NULL);
return NULL;
}
/**
* virConnectOpenAuth:
* @name: (optional) URI of the hypervisor
* @auth: Authenticate callback parameters
* @flags: bitwise-OR of virConnectFlags
*
* This function should be called first to get a connection to the
* Hypervisor. If necessary, authentication will be performed fetching
* credentials via the callback
*
* See virConnectOpen for notes about environment variables which can
* have an effect on opening drivers and freeing the connection resources
*
* URIs are documented at http://libvirt.org/uri.html
*
* Returns a pointer to the hypervisor connection or NULL in case of error
*/
virConnectPtr
virConnectOpenAuth(const char *name,
virConnectAuthPtr auth,
unsigned int flags)
{
virConnectPtr ret = NULL;
if (virInitialize() < 0)
goto error;
VIR_DEBUG("name=%s, auth=%p, flags=%x", NULLSTR(name), auth, flags);
virResetLastError();
ret = do_open(name, auth, flags);
if (!ret)
goto error;
return ret;
error:
virDispatchError(NULL);
return NULL;
}
/**
* virConnectClose:
* @conn: pointer to the hypervisor connection
*
* This function closes the connection to the Hypervisor. This should
* not be called if further interaction with the Hypervisor are needed
* especially if there is running domain which need further monitoring by
* the application.
*
* Connections are reference counted; the count is explicitly
* increased by the initial open (virConnectOpen, virConnectOpenAuth,
* and the like) as well as virConnectRef; it is also temporarily
* increased by other API that depend on the connection remaining
* alive. The open and every virConnectRef call should have a
* matching virConnectClose, and all other references will be released
* after the corresponding operation completes.
*
* Returns a positive number if at least 1 reference remains on
* success. The returned value should not be assumed to be the total
* reference count. A return of 0 implies no references remain and
* the connection is closed and memory has been freed. A return of -1
* implies a failure.
*
* It is possible for the last virConnectClose to return a positive
* value if some other object still has a temporary reference to the
* connection, but the application should not try to further use a
* connection after the virConnectClose that matches the initial open.
*/
int
virConnectClose(virConnectPtr conn)
{
VIR_DEBUG("conn=%p", conn);
virResetLastError();
virCheckConnectReturn(conn, -1);
if (!virObjectUnref(conn))
return 0;
return 1;
}
/* Helper function called to validate incoming client array on any
* interface that sets typed parameters in the hypervisor. */
int
virTypedParameterValidateSet(virConnectPtr conn,
virTypedParameterPtr params,
int nparams)
{
bool string_okay;
size_t i;
string_okay = VIR_DRV_SUPPORTS_FEATURE(conn->driver,
conn,
VIR_DRV_FEATURE_TYPED_PARAM_STRING);
for (i = 0; i < nparams; i++) {
if (strnlen(params[i].field, VIR_TYPED_PARAM_FIELD_LENGTH) ==
VIR_TYPED_PARAM_FIELD_LENGTH) {
virReportInvalidArg(params,
_("string parameter name '%.*s' too long"),
VIR_TYPED_PARAM_FIELD_LENGTH,
params[i].field);
return -1;
}
if (params[i].type == VIR_TYPED_PARAM_STRING) {
if (string_okay) {
if (!params[i].value.s) {
virReportInvalidArg(params,
_("NULL string parameter '%s'"),
params[i].field);
return -1;
}
} else {
virReportInvalidArg(params,
_("string parameter '%s' unsupported"),
params[i].field);
return -1;
}
}
}
return 0;
}
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