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|
/*
* storage_backend_iscsi.c: storage backend for iSCSI handling
*
* Copyright (C) 2007-2014 Red Hat, Inc.
* Copyright (C) 2007-2008 Daniel P. Berrange
*
* 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: Daniel P. Berrange <berrange@redhat.com>
*/
#include <config.h>
#include <dirent.h>
#include <sys/wait.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include "datatypes.h"
#include "driver.h"
#include "storage_backend_scsi.h"
#include "storage_backend_iscsi.h"
#include "viralloc.h"
#include "vircommand.h"
#include "virerror.h"
#include "virfile.h"
#include "viriscsi.h"
#include "virlog.h"
#include "virobject.h"
#include "virstring.h"
#include "viruuid.h"
#define VIR_FROM_THIS VIR_FROM_STORAGE
VIR_LOG_INIT("storage.storage_backend_iscsi");
#define ISCSI_DEFAULT_TARGET_PORT 3260
static char *
virStorageBackendISCSIPortal(virStoragePoolSourcePtr source)
{
char *portal = NULL;
if (source->nhost != 1) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Expected exactly 1 host for the storage pool"));
return NULL;
}
if (source->hosts[0].port == 0)
source->hosts[0].port = ISCSI_DEFAULT_TARGET_PORT;
if (strchr(source->hosts[0].name, ':')) {
ignore_value(virAsprintf(&portal, "[%s]:%d,1",
source->hosts[0].name,
source->hosts[0].port));
} else {
ignore_value(virAsprintf(&portal, "%s:%d,1",
source->hosts[0].name,
source->hosts[0].port));
}
return portal;
}
static char *
virStorageBackendISCSISession(virStoragePoolObjPtr pool,
bool probe)
{
return virISCSIGetSession(pool->def->source.devices[0].path, probe);
}
static int
virStorageBackendISCSIGetHostNumber(const char *sysfs_path,
uint32_t *host)
{
int retval = 0;
DIR *sysdir = NULL;
struct dirent *dirent = NULL;
int direrr;
VIR_DEBUG("Finding host number from '%s'", sysfs_path);
virFileWaitForDevices();
sysdir = opendir(sysfs_path);
if (sysdir == NULL) {
virReportSystemError(errno,
_("Failed to opendir path '%s'"), sysfs_path);
retval = -1;
goto out;
}
while ((direrr = virDirRead(sysdir, &dirent, sysfs_path)) > 0) {
if (STREQLEN(dirent->d_name, "target", strlen("target"))) {
if (sscanf(dirent->d_name,
"target%u:", host) != 1) {
VIR_DEBUG("Failed to parse target '%s'", dirent->d_name);
retval = -1;
break;
}
}
}
if (direrr < 0)
retval = -1;
closedir(sysdir);
out:
return retval;
}
static int
virStorageBackendISCSIFindLUs(virStoragePoolObjPtr pool,
const char *session)
{
char *sysfs_path;
int retval = -1;
uint32_t host;
if (virAsprintf(&sysfs_path,
"/sys/class/iscsi_session/session%s/device", session) < 0)
goto cleanup;
if (virStorageBackendISCSIGetHostNumber(sysfs_path, &host) < 0) {
virReportSystemError(errno,
_("Failed to get host number for iSCSI session "
"with path '%s'"),
sysfs_path);
goto cleanup;
}
if (virStorageBackendSCSIFindLUs(pool, host) < 0)
goto cleanup;
retval = 0;
cleanup:
VIR_FREE(sysfs_path);
return retval;
}
static char *
virStorageBackendISCSIFindPoolSources(virConnectPtr conn ATTRIBUTE_UNUSED,
const char *srcSpec,
unsigned int flags)
{
virStoragePoolSourcePtr source = NULL;
size_t ntargets = 0;
char **targets = NULL;
char *ret = NULL;
size_t i;
virStoragePoolSourceList list = {
.type = VIR_STORAGE_POOL_ISCSI,
.nsources = 0,
.sources = NULL
};
char *portal = NULL;
virCheckFlags(0, NULL);
if (!srcSpec) {
virReportError(VIR_ERR_INVALID_ARG, "%s",
_("hostname must be specified for iscsi sources"));
return NULL;
}
if (!(source = virStoragePoolDefParseSourceString(srcSpec,
list.type)))
return NULL;
if (source->nhost != 1) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Expected exactly 1 host for the storage pool"));
goto cleanup;
}
if (!(portal = virStorageBackendISCSIPortal(source)))
goto cleanup;
if (virISCSIScanTargets(portal,
source->initiator.iqn,
&ntargets, &targets) < 0)
goto cleanup;
if (VIR_ALLOC_N(list.sources, ntargets) < 0)
goto cleanup;
for (i = 0; i < ntargets; i++) {
if (VIR_ALLOC_N(list.sources[i].devices, 1) < 0 ||
VIR_ALLOC_N(list.sources[i].hosts, 1) < 0)
goto cleanup;
list.sources[i].nhost = 1;
list.sources[i].hosts[0] = source->hosts[0];
list.sources[i].initiator = source->initiator;
list.sources[i].ndevice = 1;
list.sources[i].devices[0].path = targets[i];
list.nsources++;
}
if (!(ret = virStoragePoolSourceListFormat(&list)))
goto cleanup;
cleanup:
if (list.sources) {
for (i = 0; i < ntargets; i++) {
VIR_FREE(list.sources[i].hosts);
VIR_FREE(list.sources[i].devices);
}
VIR_FREE(list.sources);
}
for (i = 0; i < ntargets; i++)
VIR_FREE(targets[i]);
VIR_FREE(targets);
VIR_FREE(portal);
virStoragePoolSourceFree(source);
return ret;
}
static int
virStorageBackendISCSICheckPool(virStoragePoolObjPtr pool,
bool *isActive)
{
char *session = NULL;
int ret = -1;
*isActive = false;
if (pool->def->source.nhost != 1) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Expected exactly 1 host for the storage pool"));
return -1;
}
if (pool->def->source.hosts[0].name == NULL) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("missing source host"));
return -1;
}
if (pool->def->source.ndevice != 1 ||
pool->def->source.devices[0].path == NULL) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("missing source device"));
return -1;
}
if ((session = virStorageBackendISCSISession(pool, true)) != NULL) {
*isActive = true;
VIR_FREE(session);
}
ret = 0;
return ret;
}
static int
virStorageBackendISCSISetAuth(const char *portal,
virConnectPtr conn,
virStoragePoolSourcePtr source)
{
virSecretPtr secret = NULL;
unsigned char *secret_value = NULL;
virStorageAuthDefPtr authdef = source->auth;
int ret = -1;
char uuidStr[VIR_UUID_STRING_BUFLEN];
if (!authdef || authdef->authType == VIR_STORAGE_AUTH_TYPE_NONE)
return 0;
VIR_DEBUG("username='%s' authType=%d secretType=%d",
authdef->username, authdef->authType, authdef->secretType);
if (authdef->authType != VIR_STORAGE_AUTH_TYPE_CHAP) {
virReportError(VIR_ERR_XML_ERROR, "%s",
_("iscsi pool only supports 'chap' auth type"));
return -1;
}
if (!conn) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("iscsi 'chap' authentication not supported "
"for autostarted pools"));
return -1;
}
if (authdef->secretType == VIR_STORAGE_SECRET_TYPE_UUID)
secret = virSecretLookupByUUID(conn, authdef->secret.uuid);
else
secret = virSecretLookupByUsage(conn, VIR_SECRET_USAGE_TYPE_ISCSI,
authdef->secret.usage);
if (secret) {
size_t secret_size;
secret_value =
conn->secretDriver->secretGetValue(secret, &secret_size, 0,
VIR_SECRET_GET_VALUE_INTERNAL_CALL);
if (!secret_value) {
if (authdef->secretType == VIR_STORAGE_SECRET_TYPE_UUID) {
virUUIDFormat(authdef->secret.uuid, uuidStr);
virReportError(VIR_ERR_INTERNAL_ERROR,
_("could not get the value of the secret "
"for username %s using uuid '%s'"),
authdef->username, uuidStr);
} else {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("could not get the value of the secret "
"for username %s using usage value '%s'"),
authdef->username, authdef->secret.usage);
}
goto cleanup;
}
} else {
if (authdef->secretType == VIR_STORAGE_SECRET_TYPE_UUID) {
virUUIDFormat(authdef->secret.uuid, uuidStr);
virReportError(VIR_ERR_NO_SECRET,
_("no secret matches uuid '%s'"),
uuidStr);
} else {
virReportError(VIR_ERR_NO_SECRET,
_("no secret matches usage value '%s'"),
authdef->secret.usage);
}
goto cleanup;
}
if (virISCSINodeUpdate(portal,
source->devices[0].path,
"node.session.auth.authmethod",
"CHAP") < 0 ||
virISCSINodeUpdate(portal,
source->devices[0].path,
"node.session.auth.username",
authdef->username) < 0 ||
virISCSINodeUpdate(portal,
source->devices[0].path,
"node.session.auth.password",
(const char *)secret_value) < 0)
goto cleanup;
ret = 0;
cleanup:
virObjectUnref(secret);
VIR_FREE(secret_value);
return ret;
}
static int
virStorageBackendISCSIStartPool(virConnectPtr conn,
virStoragePoolObjPtr pool)
{
char *portal = NULL;
char *session = NULL;
int ret = -1;
if (pool->def->source.nhost != 1) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Expected exactly 1 host for the storage pool"));
return -1;
}
if (pool->def->source.hosts[0].name == NULL) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("missing source host"));
return -1;
}
if (pool->def->source.ndevice != 1 ||
pool->def->source.devices[0].path == NULL) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("missing source device"));
return -1;
}
if ((session = virStorageBackendISCSISession(pool, true)) == NULL) {
if ((portal = virStorageBackendISCSIPortal(&pool->def->source)) == NULL)
goto cleanup;
/*
* iscsiadm doesn't let you login to a target, unless you've
* first issued a 'sendtargets' command to the portal :-(
*/
if (virISCSIScanTargets(portal,
pool->def->source.initiator.iqn,
NULL, NULL) < 0)
goto cleanup;
if (virStorageBackendISCSISetAuth(portal, conn, &pool->def->source) < 0)
goto cleanup;
if (virISCSIConnectionLogin(portal,
pool->def->source.initiator.iqn,
pool->def->source.devices[0].path) < 0)
goto cleanup;
}
ret = 0;
cleanup:
VIR_FREE(portal);
VIR_FREE(session);
return ret;
}
static int
virStorageBackendISCSIRefreshPool(virConnectPtr conn ATTRIBUTE_UNUSED,
virStoragePoolObjPtr pool)
{
char *session = NULL;
pool->def->allocation = pool->def->capacity = pool->def->available = 0;
if ((session = virStorageBackendISCSISession(pool, false)) == NULL)
goto cleanup;
if (virISCSIRescanLUNs(session) < 0)
goto cleanup;
if (virStorageBackendISCSIFindLUs(pool, session) < 0)
goto cleanup;
VIR_FREE(session);
return 0;
cleanup:
VIR_FREE(session);
return -1;
}
static int
virStorageBackendISCSIStopPool(virConnectPtr conn ATTRIBUTE_UNUSED,
virStoragePoolObjPtr pool)
{
char *portal;
char *session;
int ret = -1;
if ((session = virStorageBackendISCSISession(pool, true)) == NULL)
return 0;
VIR_FREE(session);
if ((portal = virStorageBackendISCSIPortal(&pool->def->source)) == NULL)
return -1;
if (virISCSIConnectionLogout(portal,
pool->def->source.initiator.iqn,
pool->def->source.devices[0].path) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(portal);
return ret;
}
virStorageBackend virStorageBackendISCSI = {
.type = VIR_STORAGE_POOL_ISCSI,
.checkPool = virStorageBackendISCSICheckPool,
.startPool = virStorageBackendISCSIStartPool,
.refreshPool = virStorageBackendISCSIRefreshPool,
.stopPool = virStorageBackendISCSIStopPool,
.findPoolSources = virStorageBackendISCSIFindPoolSources,
.uploadVol = virStorageBackendVolUploadLocal,
.downloadVol = virStorageBackendVolDownloadLocal,
.wipeVol = virStorageBackendVolWipeLocal,
};
|