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diff --git a/daemons/fenced/fenced_cib.c b/daemons/fenced/fenced_cib.c
index a10777a449..cb673dfa6d 100644
--- a/daemons/fenced/fenced_cib.c
+++ b/daemons/fenced/fenced_cib.c
@@ -1,639 +1,637 @@
/*
* Copyright 2009-2025 the Pacemaker project contributors
*
* The version control history for this file may have further details.
*
* This source code is licensed under the GNU General Public License version 2
* or later (GPLv2+) WITHOUT ANY WARRANTY.
*/
#include <crm_internal.h>
#include <stdbool.h>
#include <stdio.h>
#include <libxml/tree.h> // xmlNode
#include <libxml/xpath.h> // xmlXPathObject, etc.
#include <crm/crm.h>
#include <crm/common/xml.h>
#include <crm/cluster/internal.h>
#include <crm/cib.h>
#include <crm/cib/internal.h>
#include <pacemaker-fenced.h>
static xmlNode *local_cib = NULL;
static cib_t *cib_api = NULL;
static bool have_cib_devices = FALSE;
/*!
* \internal
* \brief Check whether a node has a specific attribute name/value
*
* \param[in] node Name of node to check
* \param[in] name Name of an attribute to look for
* \param[in] value The value the named attribute needs to be set to in order to be considered a match
*
* \return TRUE if the locally cached CIB has the specified node attribute
*/
gboolean
node_has_attr(const char *node, const char *name, const char *value)
{
GString *xpath = NULL;
xmlNode *match;
CRM_CHECK((local_cib != NULL) && (node != NULL) && (name != NULL)
&& (value != NULL), return FALSE);
/* Search for the node's attributes in the CIB. While the schema allows
* multiple sets of instance attributes, and allows instance attributes to
* use id-ref to reference values elsewhere, that is intended for resources,
* so we ignore that here.
*/
xpath = g_string_sized_new(256);
pcmk__g_strcat(xpath,
"//" PCMK_XE_NODES "/" PCMK_XE_NODE
"[@" PCMK_XA_UNAME "='", node, "']"
"/" PCMK_XE_INSTANCE_ATTRIBUTES
"/" PCMK_XE_NVPAIR
"[@" PCMK_XA_NAME "='", name, "' "
"and @" PCMK_XA_VALUE "='", value, "']", NULL);
match = pcmk__xpath_find_one(local_cib->doc, xpath->str, LOG_NEVER);
g_string_free(xpath, TRUE);
return (match != NULL);
}
static void
add_topology_level(xmlNode *match)
{
char *desc = NULL;
pcmk__action_result_t result = PCMK__UNKNOWN_RESULT;
CRM_CHECK(match != NULL, return);
fenced_register_level(match, &desc, &result);
fenced_send_config_notification(STONITH_OP_LEVEL_ADD, &result, desc);
pcmk__reset_result(&result);
free(desc);
}
static void
topology_remove_helper(const char *node, int level)
{
char *desc = NULL;
pcmk__action_result_t result = PCMK__UNKNOWN_RESULT;
xmlNode *data = pcmk__xe_create(NULL, PCMK_XE_FENCING_LEVEL);
crm_xml_add(data, PCMK__XA_ST_ORIGIN, __func__);
crm_xml_add_int(data, PCMK_XA_INDEX, level);
crm_xml_add(data, PCMK_XA_TARGET, node);
fenced_unregister_level(data, &desc, &result);
fenced_send_config_notification(STONITH_OP_LEVEL_DEL, &result, desc);
pcmk__reset_result(&result);
pcmk__xml_free(data);
free(desc);
}
static void
remove_topology_level(xmlNode *match)
{
int index = 0;
char *key = NULL;
CRM_CHECK(match != NULL, return);
key = stonith_level_key(match, fenced_target_by_unknown);
crm_element_value_int(match, PCMK_XA_INDEX, &index);
topology_remove_helper(key, index);
free(key);
}
static void
register_fencing_topology(xmlXPathObjectPtr xpathObj)
{
int max = pcmk__xpath_num_results(xpathObj);
for (int lpc = 0; lpc < max; lpc++) {
xmlNode *match = pcmk__xpath_result(xpathObj, lpc);
if (match == NULL) {
continue;
}
remove_topology_level(match);
add_topology_level(match);
}
}
/* Fencing
<diff crm_feature_set="3.0.6">
<diff-removed>
<fencing-topology>
<fencing-level id="f-p1.1" target="pcmk-1" index="1" devices="poison-pill" __crm_diff_marker__="removed:top"/>
<fencing-level id="f-p1.2" target="pcmk-1" index="2" devices="power" __crm_diff_marker__="removed:top"/>
<fencing-level devices="disk,network" id="f-p2.1"/>
</fencing-topology>
</diff-removed>
<diff-added>
<fencing-topology>
<fencing-level id="f-p.1" target="pcmk-1" index="1" devices="poison-pill" __crm_diff_marker__="added:top"/>
<fencing-level id="f-p2.1" target="pcmk-2" index="1" devices="disk,something"/>
<fencing-level id="f-p3.1" target="pcmk-2" index="2" devices="power" __crm_diff_marker__="added:top"/>
</fencing-topology>
</diff-added>
</diff>
*/
void
fencing_topology_init(void)
{
xmlXPathObject *xpathObj = NULL;
const char *xpath = "//" PCMK_XE_FENCING_LEVEL;
crm_trace("Full topology refresh");
free_topology_list();
init_topology_list();
/* Grab everything */
xpathObj = pcmk__xpath_search(local_cib->doc, xpath);
register_fencing_topology(xpathObj);
xmlXPathFreeObject(xpathObj);
}
#define XPATH_WATCHDOG_TIMEOUT "//" PCMK_XE_NVPAIR \
"[@" PCMK_XA_NAME "='" \
PCMK_OPT_STONITH_WATCHDOG_TIMEOUT "']"
static void
update_stonith_watchdog_timeout_ms(xmlNode *cib)
{
long long timeout_ms = 0;
xmlNode *stonith_watchdog_xml = NULL;
const char *value = NULL;
// @TODO An XPath search can't handle multiple instances or rules
stonith_watchdog_xml = pcmk__xpath_find_one(cib->doc,
XPATH_WATCHDOG_TIMEOUT,
LOG_NEVER);
if (stonith_watchdog_xml) {
value = crm_element_value(stonith_watchdog_xml, PCMK_XA_VALUE);
}
if (value) {
timeout_ms = crm_get_msec(value);
}
if (timeout_ms < 0) {
timeout_ms = pcmk__auto_stonith_watchdog_timeout();
}
stonith_watchdog_timeout_ms = timeout_ms;
}
/*!
* \internal
* \brief Update all STONITH device definitions based on current CIB
*/
static void
cib_devices_update(void)
{
GHashTableIter iter;
stonith_device_t *device = NULL;
crm_info("Updating devices to version %s.%s.%s",
crm_element_value(local_cib, PCMK_XA_ADMIN_EPOCH),
crm_element_value(local_cib, PCMK_XA_EPOCH),
crm_element_value(local_cib, PCMK_XA_NUM_UPDATES));
g_hash_table_iter_init(&iter, device_list);
while (g_hash_table_iter_next(&iter, NULL, (void **)&device)) {
if (device->cib_registered) {
device->dirty = TRUE;
}
}
/* have list repopulated if cib has a watchdog-fencing-resource
TODO: keep a cached list for queries happening while we are refreshing
*/
g_list_free_full(stonith_watchdog_targets, free);
stonith_watchdog_targets = NULL;
fenced_scheduler_run(local_cib);
g_hash_table_iter_init(&iter, device_list);
while (g_hash_table_iter_next(&iter, NULL, (void **)&device)) {
if (device->dirty) {
g_hash_table_iter_remove(&iter);
}
}
}
#define PRIMITIVE_ID_XP_FRAGMENT "/" PCMK_XE_PRIMITIVE "[@" PCMK_XA_ID "='"
static void
update_cib_stonith_devices(const char *event, xmlNode * msg)
{
int format = 1;
const xmlNode *wrapper = pcmk__xe_first_child(msg,
PCMK__XE_CIB_UPDATE_RESULT,
NULL, NULL);
const xmlNode *patchset = pcmk__xe_first_child(wrapper, NULL, NULL, NULL);
char *reason = NULL;
CRM_CHECK(patchset != NULL, return);
crm_element_value_int(patchset, PCMK_XA_FORMAT, &format);
if (format != 2) {
crm_warn("Unknown patch format: %d", format);
return;
}
for (const xmlNode *change = pcmk__xe_first_child(patchset, NULL, NULL,
NULL);
change != NULL; change = pcmk__xe_next(change, NULL)) {
const char *op = crm_element_value(change, PCMK_XA_OPERATION);
const char *xpath = crm_element_value(change, PCMK_XA_PATH);
+ const char *primitive_xpath = NULL;
if (pcmk__str_eq(op, PCMK_VALUE_MOVE, pcmk__str_null_matches)
|| (strstr(xpath, "/" PCMK_XE_STATUS) != NULL)) {
continue;
}
- if (pcmk__str_eq(op, PCMK_VALUE_DELETE, pcmk__str_none)
- && (strstr(xpath, "/" PCMK_XE_PRIMITIVE) != NULL)) {
+ primitive_xpath = strstr(xpath, PRIMITIVE_ID_XP_FRAGMENT);
+ if ((primitive_xpath != NULL)
+ && pcmk__str_eq(op, PCMK_VALUE_DELETE, pcmk__str_none)) {
+
const char *rsc_id = NULL;
const char *end_quote = NULL;
char *copy = NULL;
- if ((strstr(xpath, PCMK_XE_INSTANCE_ATTRIBUTES) != NULL)
- || (strstr(xpath, PCMK_XE_META_ATTRIBUTES) != NULL)) {
+ if ((strstr(primitive_xpath, PCMK_XE_INSTANCE_ATTRIBUTES) != NULL)
+ || (strstr(primitive_xpath, PCMK_XE_META_ATTRIBUTES) != NULL)) {
reason = pcmk__str_copy("(meta) attribute deleted from "
"resource");
break;
}
- rsc_id = strstr(xpath, PRIMITIVE_ID_XP_FRAGMENT);
- if (rsc_id == NULL) {
- continue;
- }
-
- rsc_id += sizeof(PRIMITIVE_ID_XP_FRAGMENT) - 1;
+ rsc_id = primitive_xpath + sizeof(PRIMITIVE_ID_XP_FRAGMENT) - 1;
end_quote = strchr(rsc_id, '\'');
CRM_LOG_ASSERT(end_quote != NULL);
if (end_quote == NULL) {
crm_err("Bug: Malformed item in Pacemaker-generated patchset");
continue;
}
/* A primitive resource was removed. If it was a fencing resource,
* it's faster to remove it directly than to run the scheduler and
* update all device registrations.
*/
copy = strndup(rsc_id, end_quote - rsc_id);
pcmk__assert(copy != NULL);
stonith_device_remove(copy, true);
/* watchdog_device_update called afterwards
to fall back to implicit definition if needed */
free(copy);
continue;
}
if (strstr(xpath, "/" PCMK_XE_RESOURCES)
|| strstr(xpath, "/" PCMK_XE_CONSTRAINTS)
|| strstr(xpath, "/" PCMK_XE_RSC_DEFAULTS)) {
const char *shortpath = strrchr(xpath, '/');
reason = crm_strdup_printf("%s %s", op, shortpath + 1);
break;
}
}
if (reason != NULL) {
crm_info("Updating device list from CIB: %s", reason);
cib_devices_update();
free(reason);
} else {
crm_trace("No updates for device list found in CIB");
}
}
static void
watchdog_device_update(void)
{
if (stonith_watchdog_timeout_ms > 0) {
if (!g_hash_table_lookup(device_list, STONITH_WATCHDOG_ID) &&
!stonith_watchdog_targets) {
/* getting here watchdog-fencing enabled, no device there yet
and reason isn't stonith_watchdog_targets preventing that
*/
int rc;
xmlNode *xml;
xml = create_device_registration_xml(
STONITH_WATCHDOG_ID,
st_namespace_internal,
STONITH_WATCHDOG_AGENT,
NULL, /* stonith_device_register will add our
own name as PCMK_STONITH_HOST_LIST param
so we can skip that here
*/
NULL);
rc = stonith_device_register(xml, TRUE);
pcmk__xml_free(xml);
if (rc != pcmk_ok) {
rc = pcmk_legacy2rc(rc);
exit_code = CRM_EX_FATAL;
crm_crit("Cannot register watchdog pseudo fence agent: %s",
pcmk_rc_str(rc));
stonith_shutdown(0);
}
}
} else if (g_hash_table_lookup(device_list, STONITH_WATCHDOG_ID) != NULL) {
/* be silent if no device - todo parameter to stonith_device_remove */
stonith_device_remove(STONITH_WATCHDOG_ID, true);
}
}
/*!
* \internal
* \brief Query the full CIB
*
* \return Standard Pacemaker return code
*/
static int
fenced_query_cib(void)
{
int rc = pcmk_ok;
crm_trace("Re-requesting full CIB");
rc = cib_api->cmds->query(cib_api, NULL, &local_cib, cib_sync_call);
rc = pcmk_legacy2rc(rc);
if (rc == pcmk_rc_ok) {
pcmk__assert(local_cib != NULL);
} else {
crm_err("Couldn't retrieve the CIB: %s " QB_XS " rc=%d",
pcmk_rc_str(rc), rc);
}
return rc;
}
static void
update_fencing_topology(const char *event, xmlNode *msg)
{
xmlNode *wrapper = pcmk__xe_first_child(msg, PCMK__XE_CIB_UPDATE_RESULT,
NULL, NULL);
xmlNode *patchset = pcmk__xe_first_child(wrapper, NULL, NULL, NULL);
int format = 1;
int add[] = { 0, 0, 0 };
int del[] = { 0, 0, 0 };
CRM_CHECK(patchset != NULL, return);
crm_element_value_int(patchset, PCMK_XA_FORMAT, &format);
if (format != 2) {
crm_warn("Unknown patch format: %d", format);
return;
}
xml_patch_versions(patchset, add, del);
for (xmlNode *change = pcmk__xe_first_child(patchset, NULL, NULL, NULL);
change != NULL; change = pcmk__xe_next(change, NULL)) {
const char *op = crm_element_value(change, PCMK_XA_OPERATION);
const char *xpath = crm_element_value(change, PCMK_XA_PATH);
if (op == NULL) {
continue;
}
if (strstr(xpath, "/" PCMK_XE_FENCING_LEVEL) != NULL) {
// Change to a specific entry
crm_trace("Handling %s operation %d.%d.%d for %s",
op, add[0], add[1], add[2], xpath);
if (strcmp(op, PCMK_VALUE_DELETE) == 0) {
/* We have only path and ID, which is not enough info to remove
* a specific entry. Re-initialize the whole topology.
*/
crm_info("Re-initializing fencing topology after %s operation "
"%d.%d.%d for %s",
op, add[0], add[1], add[2], xpath);
fencing_topology_init();
return;
}
if (strcmp(op, PCMK_VALUE_CREATE) == 0) {
add_topology_level(change->children);
} else if (strcmp(op, PCMK_VALUE_MODIFY) == 0) {
xmlNode *match = pcmk__xe_first_child(change,
PCMK_XE_CHANGE_RESULT,
NULL, NULL);
if (match != NULL) {
remove_topology_level(match->children);
add_topology_level(match->children);
}
}
continue;
}
if (strstr(xpath, "/" PCMK_XE_FENCING_TOPOLOGY) != NULL) {
// Change to the topology in general
crm_info("Re-initializing fencing topology after top-level "
"%s operation %d.%d.%d for %s",
op, add[0], add[1], add[2], xpath);
fencing_topology_init();
return;
}
if ((strstr(xpath, "/" PCMK_XE_CONFIGURATION) != NULL)
&& (pcmk__xe_first_child(change, PCMK_XE_FENCING_TOPOLOGY, NULL,
NULL) != NULL)
&& pcmk__str_any_of(op, PCMK_VALUE_CREATE, PCMK_VALUE_DELETE,
NULL)) {
// Topology was created or entire configuration section was deleted
crm_info("Re-initializing fencing topology after top-level "
"%s operation %d.%d.%d for %s",
op, add[0], add[1], add[2], xpath);
fencing_topology_init();
return;
}
crm_trace("Nothing for us in %s operation %d.%d.%d for %s",
op, add[0], add[1], add[2], xpath);
}
}
static void
update_cib_cache_cb(const char *event, xmlNode * msg)
{
long long timeout_ms_saved = stonith_watchdog_timeout_ms;
bool need_full_refresh = false;
if(!have_cib_devices) {
crm_trace("Skipping updates until we get a full dump");
return;
} else if(msg == NULL) {
crm_trace("Missing %s update", event);
return;
}
/* Maintain a local copy of the CIB so that we have full access
* to device definitions, location constraints, and node attributes
*/
if (local_cib != NULL) {
int rc = pcmk_ok;
xmlNode *wrapper = NULL;
xmlNode *patchset = NULL;
crm_element_value_int(msg, PCMK__XA_CIB_RC, &rc);
if (rc != pcmk_ok) {
return;
}
wrapper = pcmk__xe_first_child(msg, PCMK__XE_CIB_UPDATE_RESULT, NULL,
NULL);
patchset = pcmk__xe_first_child(wrapper, NULL, NULL, NULL);
rc = xml_apply_patchset(local_cib, patchset, TRUE);
switch (rc) {
case pcmk_ok:
case -pcmk_err_old_data:
break;
case -pcmk_err_diff_resync:
case -pcmk_err_diff_failed:
crm_notice("[%s] Patch aborted: %s (%d)", event, pcmk_strerror(rc), rc);
pcmk__xml_free(local_cib);
local_cib = NULL;
break;
default:
crm_warn("[%s] ABORTED: %s (%d)", event, pcmk_strerror(rc), rc);
pcmk__xml_free(local_cib);
local_cib = NULL;
}
}
if (local_cib == NULL) {
if (fenced_query_cib() != pcmk_rc_ok) {
return;
}
need_full_refresh = true;
}
pcmk__refresh_node_caches_from_cib(local_cib);
update_stonith_watchdog_timeout_ms(local_cib);
if (timeout_ms_saved != stonith_watchdog_timeout_ms) {
need_full_refresh = true;
}
if (need_full_refresh) {
fencing_topology_init();
cib_devices_update();
} else {
// Partial refresh
update_fencing_topology(event, msg);
update_cib_stonith_devices(event, msg);
}
watchdog_device_update();
}
static void
init_cib_cache_cb(xmlNode * msg, int call_id, int rc, xmlNode * output, void *user_data)
{
crm_info("Updating device list from CIB");
have_cib_devices = TRUE;
local_cib = pcmk__xml_copy(NULL, output);
pcmk__refresh_node_caches_from_cib(local_cib);
update_stonith_watchdog_timeout_ms(local_cib);
fencing_topology_init();
cib_devices_update();
watchdog_device_update();
}
static void
cib_connection_destroy(gpointer user_data)
{
if (stonith_shutdown_flag) {
crm_info("Connection to the CIB manager closed");
return;
} else {
crm_crit("Lost connection to the CIB manager, shutting down");
}
if (cib_api) {
cib_api->cmds->signoff(cib_api);
}
stonith_shutdown(0);
}
/*!
* \internal
* \brief Disconnect from CIB manager
*/
void
fenced_cib_cleanup(void)
{
if (cib_api != NULL) {
cib_api->cmds->del_notify_callback(cib_api, PCMK__VALUE_CIB_DIFF_NOTIFY,
update_cib_cache_cb);
cib__clean_up_connection(&cib_api);
}
pcmk__xml_free(local_cib);
local_cib = NULL;
}
void
setup_cib(void)
{
int rc, retries = 0;
cib_api = cib_new();
if (cib_api == NULL) {
crm_err("No connection to the CIB manager");
return;
}
do {
sleep(retries);
rc = cib_api->cmds->signon(cib_api, crm_system_name, cib_command);
} while (rc == -ENOTCONN && ++retries < 5);
if (rc != pcmk_ok) {
crm_err("Could not connect to the CIB manager: %s (%d)", pcmk_strerror(rc), rc);
return;
}
rc = cib_api->cmds->add_notify_callback(cib_api,
PCMK__VALUE_CIB_DIFF_NOTIFY,
update_cib_cache_cb);
if (rc != pcmk_ok) {
crm_err("Could not set CIB notification callback");
return;
}
rc = cib_api->cmds->query(cib_api, NULL, NULL, cib_none);
cib_api->cmds->register_callback(cib_api, rc, 120, FALSE, NULL,
"init_cib_cache_cb", init_cib_cache_cb);
cib_api->cmds->set_connection_dnotify(cib_api, cib_connection_destroy);
crm_info("Watching for fencing topology changes");
}

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