diff --git a/lib/common/crmcommon_private.h b/lib/common/crmcommon_private.h
index 4a71b5c530..a992264cdd 100644
--- a/lib/common/crmcommon_private.h
+++ b/lib/common/crmcommon_private.h
@@ -1,483 +1,483 @@
/*
* Copyright 2018-2025 the Pacemaker project contributors
*
* The version control history for this file may have further details.
*
* This source code is licensed under the GNU Lesser General Public License
* version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
*/
#ifndef PCMK__COMMON_CRMCOMMON_PRIVATE__H
#define PCMK__COMMON_CRMCOMMON_PRIVATE__H
/* This header is for the sole use of libcrmcommon, so that functions can be
* declared with G_GNUC_INTERNAL for efficiency.
*/
#include <stdint.h> // uint8_t, uint32_t
#include <stdbool.h> // bool
#include <sys/types.h> // size_t
#include <glib.h> // G_GNUC_INTERNAL, G_GNUC_PRINTF, gchar, etc.
#include <libxml/tree.h> // xmlNode, xmlAttr
#include <libxml/xmlstring.h> // xmlChar
#include <qb/qbipcc.h> // struct qb_ipc_response_header
#include <crm/common/ipc.h> // pcmk_ipc_api_t, crm_ipc_t, etc.
#include <crm/common/iso8601.h> // crm_time_t
#include <crm/common/logging.h> // LOG_NEVER
#include <crm/common/mainloop.h> // mainloop_io_t
#include <crm/common/output_internal.h> // pcmk__output_t
#include <crm/common/results.h> // crm_exit_t
#include <crm/common/rules.h> // pcmk_rule_input_t
#include <crm/common/xml_internal.h> // enum pcmk__xml_flags
#ifdef __cplusplus
extern "C" {
#endif
// Decent chunk size for processing large amounts of data
#define PCMK__BUFFER_SIZE 4096
#if defined(PCMK__UNIT_TESTING)
#undef G_GNUC_INTERNAL
#define G_GNUC_INTERNAL
#endif
/*!
* \internal
* \brief Information about an XML node that was deleted
*
* When change tracking is enabled and we delete an XML node using
* \c pcmk__xml_free(), we free it and add its path and position to a list in
* its document's private data. This allows us to display changes, generate
* patchsets, etc.
*
* Note that this does not happen when deleting an XML attribute using
* \c pcmk__xa_remove(). In that case:
* * If \c force is \c true, we remove the attribute without any tracking.
* * If \c force is \c false, we mark the attribute as deleted but leave it in
* place until we commit changes.
*/
typedef struct pcmk__deleted_xml_s {
gchar *path; //!< XPath expression identifying the deleted node
int position; //!< Position of the deleted node among its siblings
} pcmk__deleted_xml_t;
/*!
* \internal
* \brief Private data for an XML node
*/
typedef struct xml_node_private_s {
uint32_t check; //!< Magic number for checking integrity
uint32_t flags; //!< Group of <tt>enum pcmk__xml_flags</tt>
} xml_node_private_t;
/*!
* \internal
* \brief Private data for an XML document
*/
typedef struct xml_doc_private_s {
uint32_t check; //!< Magic number for checking integrity
uint32_t flags; //!< Group of <tt>enum pcmk__xml_flags</tt>
char *acl_user; //!< User affected by \c acls (for logging)
//! ACLs to check requested changes against (list of \c xml_acl_t)
GList *acls;
//! XML nodes marked as deleted (list of \c pcmk__deleted_xml_t)
GList *deleted_objs;
} xml_doc_private_t;
// XML private data magic numbers
#define PCMK__XML_DOC_PRIVATE_MAGIC 0x81726354UL
#define PCMK__XML_NODE_PRIVATE_MAGIC 0x54637281UL
// XML entity references
#define PCMK__XML_ENTITY_AMP "&"
#define PCMK__XML_ENTITY_GT ">"
#define PCMK__XML_ENTITY_LT "<"
#define PCMK__XML_ENTITY_QUOT """
#define pcmk__set_xml_flags(xml_priv, flags_to_set) do { \
(xml_priv)->flags = pcmk__set_flags_as(__func__, __LINE__, \
LOG_NEVER, "XML", "XML node", (xml_priv)->flags, \
(flags_to_set), #flags_to_set); \
} while (0)
#define pcmk__clear_xml_flags(xml_priv, flags_to_clear) do { \
(xml_priv)->flags = pcmk__clear_flags_as(__func__, __LINE__, \
LOG_NEVER, "XML", "XML node", (xml_priv)->flags, \
(flags_to_clear), #flags_to_clear); \
} while (0)
G_GNUC_INTERNAL
const char *pcmk__xml_element_type_text(xmlElementType type);
G_GNUC_INTERNAL
bool pcmk__xml_reset_node_flags(xmlNode *xml, void *user_data);
G_GNUC_INTERNAL
void pcmk__xml_set_parent_flags(xmlNode *xml, uint64_t flags);
G_GNUC_INTERNAL
void pcmk__xml_new_private_data(xmlNode *xml);
G_GNUC_INTERNAL
void pcmk__xml_free_private_data(xmlNode *xml);
G_GNUC_INTERNAL
void pcmk__xml_free_node(xmlNode *xml);
G_GNUC_INTERNAL
xmlDoc *pcmk__xml_new_doc(void);
G_GNUC_INTERNAL
int pcmk__xml_position(const xmlNode *xml, enum pcmk__xml_flags ignore_if_set);
G_GNUC_INTERNAL
-xmlNode *pcmk__xc_match(const xmlNode *root, const xmlNode *search_comment,
- bool exact);
+xmlNode *pcmk__xc_match_child(const xmlNode *parent, const xmlNode *search,
+ bool exact);
G_GNUC_INTERNAL
void pcmk__xc_update(xmlNode *parent, xmlNode *target, xmlNode *update);
G_GNUC_INTERNAL
void pcmk__free_acls(GList *acls);
G_GNUC_INTERNAL
void pcmk__unpack_acl(xmlNode *source, xmlNode *target, const char *user);
G_GNUC_INTERNAL
bool pcmk__is_user_in_group(const char *user, const char *group);
G_GNUC_INTERNAL
void pcmk__apply_acl(xmlNode *xml);
G_GNUC_INTERNAL
void pcmk__apply_creation_acl(xmlNode *xml, bool check_top);
G_GNUC_INTERNAL
int pcmk__xa_remove(xmlAttr *attr, bool force);
G_GNUC_INTERNAL
void pcmk__mark_xml_attr_dirty(xmlAttr *a);
G_GNUC_INTERNAL
bool pcmk__xa_filterable(const char *name);
G_GNUC_INTERNAL
void pcmk__log_xmllib_err(void *ctx, const char *fmt, ...)
G_GNUC_PRINTF(2, 3);
G_GNUC_INTERNAL
void pcmk__mark_xml_node_dirty(xmlNode *xml);
G_GNUC_INTERNAL
bool pcmk__marked_as_deleted(xmlAttrPtr a, void *user_data);
G_GNUC_INTERNAL
void pcmk__dump_xml_attr(const xmlAttr *attr, GString *buffer);
G_GNUC_INTERNAL
int pcmk__xe_set_score(xmlNode *target, const char *name, const char *value);
G_GNUC_INTERNAL
bool pcmk__xml_is_name_start_char(const char *utf8, int *len);
G_GNUC_INTERNAL
bool pcmk__xml_is_name_char(const char *utf8, int *len);
/*
* Date/times
*/
// For use with pcmk__add_time_from_xml()
enum pcmk__time_component {
pcmk__time_unknown,
pcmk__time_years,
pcmk__time_months,
pcmk__time_weeks,
pcmk__time_days,
pcmk__time_hours,
pcmk__time_minutes,
pcmk__time_seconds,
};
G_GNUC_INTERNAL
const char *pcmk__time_component_attr(enum pcmk__time_component component);
G_GNUC_INTERNAL
int pcmk__add_time_from_xml(crm_time_t *t, enum pcmk__time_component component,
const xmlNode *xml);
G_GNUC_INTERNAL
void pcmk__set_time_if_earlier(crm_time_t *target, const crm_time_t *source);
/*
* IPC
*/
#define PCMK__IPC_VERSION 1
#define PCMK__CONTROLD_API_MAJOR "1"
#define PCMK__CONTROLD_API_MINOR "0"
// IPC behavior that varies by daemon
typedef struct pcmk__ipc_methods_s {
/*!
* \internal
* \brief Allocate any private data needed by daemon IPC
*
* \param[in,out] api IPC API connection
*
* \return Standard Pacemaker return code
*/
int (*new_data)(pcmk_ipc_api_t *api);
/*!
* \internal
* \brief Free any private data used by daemon IPC
*
* \param[in,out] api_data Data allocated by new_data() method
*/
void (*free_data)(void *api_data);
/*!
* \internal
* \brief Perform daemon-specific handling after successful connection
*
* Some daemons require clients to register before sending any other
* commands. The controller requires a CRM_OP_HELLO (with no reply), and
* the CIB manager, executor, and fencer require a CRM_OP_REGISTER (with a
* reply). Ideally this would be consistent across all daemons, but for now
* this allows each to do its own authorization.
*
* \param[in,out] api IPC API connection
*
* \return Standard Pacemaker return code
*/
int (*post_connect)(pcmk_ipc_api_t *api);
/*!
* \internal
* \brief Check whether an IPC request results in a reply
*
* \param[in,out] api IPC API connection
* \param[in] request IPC request XML
*
* \return true if request would result in an IPC reply, false otherwise
*/
bool (*reply_expected)(pcmk_ipc_api_t *api, const xmlNode *request);
/*!
* \internal
* \brief Perform daemon-specific handling of an IPC message
*
* \param[in,out] api IPC API connection
* \param[in,out] msg Message read from IPC connection
*
* \return true if more IPC reply messages should be expected
*/
bool (*dispatch)(pcmk_ipc_api_t *api, xmlNode *msg);
/*!
* \internal
* \brief Perform daemon-specific handling of an IPC disconnect
*
* \param[in,out] api IPC API connection
*/
void (*post_disconnect)(pcmk_ipc_api_t *api);
} pcmk__ipc_methods_t;
// Implementation of pcmk_ipc_api_t
struct pcmk_ipc_api_s {
enum pcmk_ipc_server server; // Daemon this IPC API instance is for
enum pcmk_ipc_dispatch dispatch_type; // How replies should be dispatched
size_t ipc_size_max; // maximum IPC buffer size
crm_ipc_t *ipc; // IPC connection
mainloop_io_t *mainloop_io; // If using mainloop, I/O source for IPC
bool free_on_disconnect; // Whether disconnect should free object
pcmk_ipc_callback_t cb; // Caller-registered callback (if any)
void *user_data; // Caller-registered data (if any)
void *api_data; // For daemon-specific use
pcmk__ipc_methods_t *cmds; // Behavior that varies by daemon
};
typedef struct pcmk__ipc_header_s {
struct qb_ipc_response_header qb;
uint32_t size_uncompressed;
uint32_t size_compressed;
uint32_t flags;
uint8_t version;
} pcmk__ipc_header_t;
G_GNUC_INTERNAL
int pcmk__send_ipc_request(pcmk_ipc_api_t *api, const xmlNode *request);
G_GNUC_INTERNAL
void pcmk__call_ipc_callback(pcmk_ipc_api_t *api,
enum pcmk_ipc_event event_type,
crm_exit_t status, void *event_data);
G_GNUC_INTERNAL
unsigned int pcmk__ipc_buffer_size(unsigned int max);
G_GNUC_INTERNAL
bool pcmk__valid_ipc_header(const pcmk__ipc_header_t *header);
G_GNUC_INTERNAL
pcmk__ipc_methods_t *pcmk__attrd_api_methods(void);
G_GNUC_INTERNAL
pcmk__ipc_methods_t *pcmk__controld_api_methods(void);
G_GNUC_INTERNAL
pcmk__ipc_methods_t *pcmk__pacemakerd_api_methods(void);
G_GNUC_INTERNAL
pcmk__ipc_methods_t *pcmk__schedulerd_api_methods(void);
/*
* Logging
*/
//! XML is newly created
#define PCMK__XML_PREFIX_CREATED "++"
//! XML has been deleted
#define PCMK__XML_PREFIX_DELETED "--"
//! XML has been modified
#define PCMK__XML_PREFIX_MODIFIED "+ "
//! XML has been moved
#define PCMK__XML_PREFIX_MOVED "+~"
/*
* Output
*/
G_GNUC_INTERNAL
int pcmk__bare_output_new(pcmk__output_t **out, const char *fmt_name,
const char *filename, char **argv);
G_GNUC_INTERNAL
void pcmk__register_option_messages(pcmk__output_t *out);
G_GNUC_INTERNAL
void pcmk__register_patchset_messages(pcmk__output_t *out);
G_GNUC_INTERNAL
bool pcmk__output_text_get_fancy(pcmk__output_t *out);
/*
* Rules
*/
// How node attribute values may be compared in rules
enum pcmk__comparison {
pcmk__comparison_unknown,
pcmk__comparison_defined,
pcmk__comparison_undefined,
pcmk__comparison_eq,
pcmk__comparison_ne,
pcmk__comparison_lt,
pcmk__comparison_lte,
pcmk__comparison_gt,
pcmk__comparison_gte,
};
// How node attribute values may be parsed in rules
enum pcmk__type {
pcmk__type_unknown,
pcmk__type_string,
pcmk__type_integer,
pcmk__type_number,
pcmk__type_version,
};
// Where to obtain reference value for a node attribute comparison
enum pcmk__reference_source {
pcmk__source_unknown,
pcmk__source_literal,
pcmk__source_instance_attrs,
pcmk__source_meta_attrs,
};
G_GNUC_INTERNAL
enum pcmk__comparison pcmk__parse_comparison(const char *op);
G_GNUC_INTERNAL
enum pcmk__type pcmk__parse_type(const char *type, enum pcmk__comparison op,
const char *value1, const char *value2);
G_GNUC_INTERNAL
enum pcmk__reference_source pcmk__parse_source(const char *source);
G_GNUC_INTERNAL
int pcmk__cmp_by_type(const char *value1, const char *value2,
enum pcmk__type type);
G_GNUC_INTERNAL
int pcmk__unpack_duration(const xmlNode *duration, const crm_time_t *start,
crm_time_t **end);
G_GNUC_INTERNAL
int pcmk__evaluate_date_spec(const xmlNode *date_spec, const crm_time_t *now);
G_GNUC_INTERNAL
int pcmk__evaluate_attr_expression(const xmlNode *expression,
const pcmk_rule_input_t *rule_input);
G_GNUC_INTERNAL
int pcmk__evaluate_rsc_expression(const xmlNode *expr,
const pcmk_rule_input_t *rule_input);
G_GNUC_INTERNAL
int pcmk__evaluate_op_expression(const xmlNode *expr,
const pcmk_rule_input_t *rule_input);
/*
* Utils
*/
#define PCMK__PW_BUFFER_LEN 500
/*
* Schemas
*/
typedef struct {
unsigned char v[2];
} pcmk__schema_version_t;
enum pcmk__schema_validator {
pcmk__schema_validator_none,
pcmk__schema_validator_rng
};
typedef struct {
int schema_index;
char *name;
/*!
* List of XSLT stylesheets for upgrading from this schema version to the
* next one. Sorted by the order in which they should be applied to the CIB.
*/
GList *transforms;
void *cache;
enum pcmk__schema_validator validator;
pcmk__schema_version_t version;
} pcmk__schema_t;
G_GNUC_INTERNAL
GList *pcmk__find_x_0_schema(void);
#ifdef __cplusplus
}
#endif
#endif // PCMK__COMMON_CRMCOMMON_PRIVATE__H
diff --git a/lib/common/xml.c b/lib/common/xml.c
index 0eedd16d67..de2e480d09 100644
--- a/lib/common/xml.c
+++ b/lib/common/xml.c
@@ -1,1685 +1,1685 @@
/*
* Copyright 2004-2025 the Pacemaker project contributors
*
* The version control history for this file may have further details.
*
* This source code is licensed under the GNU Lesser General Public License
* version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
*/
#include <crm_internal.h>
#include <stdarg.h>
#include <stdint.h> // uint32_t
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h> // stat(), S_ISREG, etc.
#include <sys/types.h>
#include <glib.h> // gboolean, GString
#include <libxml/parser.h> // xmlCleanupParser()
#include <libxml/tree.h> // xmlNode, etc.
#include <libxml/xmlstring.h> // xmlChar, xmlGetUTF8Char()
#include <crm/crm.h>
#include <crm/common/xml.h>
#include <crm/common/xml_internal.h> // PCMK__XML_LOG_BASE, etc.
#include "crmcommon_private.h"
//! libxml2 supports only XML version 1.0, at least as of libxml2-2.12.5
#define XML_VERSION ((const xmlChar *) "1.0")
/*!
* \internal
* \brief Get a string representation of an XML element type for logging
*
* \param[in] type XML element type
*
* \return String representation of \p type
*/
const char *
pcmk__xml_element_type_text(xmlElementType type)
{
static const char *const element_type_names[] = {
[XML_ELEMENT_NODE] = "element",
[XML_ATTRIBUTE_NODE] = "attribute",
[XML_TEXT_NODE] = "text",
[XML_CDATA_SECTION_NODE] = "CDATA section",
[XML_ENTITY_REF_NODE] = "entity reference",
[XML_ENTITY_NODE] = "entity",
[XML_PI_NODE] = "PI",
[XML_COMMENT_NODE] = "comment",
[XML_DOCUMENT_NODE] = "document",
[XML_DOCUMENT_TYPE_NODE] = "document type",
[XML_DOCUMENT_FRAG_NODE] = "document fragment",
[XML_NOTATION_NODE] = "notation",
[XML_HTML_DOCUMENT_NODE] = "HTML document",
[XML_DTD_NODE] = "DTD",
[XML_ELEMENT_DECL] = "element declaration",
[XML_ATTRIBUTE_DECL] = "attribute declaration",
[XML_ENTITY_DECL] = "entity declaration",
[XML_NAMESPACE_DECL] = "namespace declaration",
[XML_XINCLUDE_START] = "XInclude start",
[XML_XINCLUDE_END] = "XInclude end",
};
// Assumes the numeric values of the indices are in ascending order
if ((type < XML_ELEMENT_NODE) || (type > XML_XINCLUDE_END)) {
return "unrecognized type";
}
return element_type_names[type];
}
/*!
* \internal
* \brief Apply a function to each XML node in a tree (pre-order, depth-first)
*
* \param[in,out] xml XML tree to traverse
* \param[in,out] fn Function to call for each node (returns \c true to
* continue traversing the tree or \c false to stop)
* \param[in,out] user_data Argument to \p fn
*
* \return \c false if any \p fn call returned \c false, or \c true otherwise
*
* \note This function is recursive.
*/
bool
pcmk__xml_tree_foreach(xmlNode *xml, bool (*fn)(xmlNode *, void *),
void *user_data)
{
if (xml == NULL) {
return true;
}
if (!fn(xml, user_data)) {
return false;
}
for (xml = pcmk__xml_first_child(xml); xml != NULL;
xml = pcmk__xml_next(xml)) {
if (!pcmk__xml_tree_foreach(xml, fn, user_data)) {
return false;
}
}
return true;
}
void
pcmk__xml_set_parent_flags(xmlNode *xml, uint64_t flags)
{
for (; xml != NULL; xml = xml->parent) {
xml_node_private_t *nodepriv = xml->_private;
if (nodepriv != NULL) {
pcmk__set_xml_flags(nodepriv, flags);
}
}
}
/*!
* \internal
* \brief Set flags for an XML document
*
* \param[in,out] doc XML document
* \param[in] flags Group of <tt>enum pcmk__xml_flags</tt>
*/
void
pcmk__xml_doc_set_flags(xmlDoc *doc, uint32_t flags)
{
if (doc != NULL) {
xml_doc_private_t *docpriv = doc->_private;
pcmk__set_xml_flags(docpriv, flags);
}
}
/*!
* \internal
* \brief Check whether the given flags are set for an XML document
*
* \param[in] doc XML document to check
* \param[in] flags Group of <tt>enum pcmk__xml_flags</tt>
*
* \return \c true if all of \p flags are set for \p doc, or \c false otherwise
*/
bool
pcmk__xml_doc_all_flags_set(const xmlDoc *doc, uint32_t flags)
{
if (doc != NULL) {
xml_doc_private_t *docpriv = doc->_private;
return (docpriv != NULL) && pcmk_all_flags_set(docpriv->flags, flags);
}
return false;
}
// Mark document, element, and all element's parents as changed
void
pcmk__mark_xml_node_dirty(xmlNode *xml)
{
if (xml == NULL) {
return;
}
pcmk__xml_doc_set_flags(xml->doc, pcmk__xf_dirty);
pcmk__xml_set_parent_flags(xml, pcmk__xf_dirty);
}
/*!
* \internal
* \brief Clear flags on an XML node
*
* \param[in,out] xml XML node whose flags to reset
* \param[in,out] user_data Ignored
*
* \return \c true (to continue traversing the tree)
*
* \note This is compatible with \c pcmk__xml_tree_foreach().
*/
bool
pcmk__xml_reset_node_flags(xmlNode *xml, void *user_data)
{
xml_node_private_t *nodepriv = xml->_private;
if (nodepriv != NULL) {
nodepriv->flags = pcmk__xf_none;
}
return true;
}
/*!
* \internal
* \brief Set the \c pcmk__xf_dirty and \c pcmk__xf_created flags on an XML node
*
* \param[in,out] xml Node whose flags to set
* \param[in] user_data Ignored
*
* \return \c true (to continue traversing the tree)
*
* \note This is compatible with \c pcmk__xml_tree_foreach().
*/
static bool
mark_xml_dirty_created(xmlNode *xml, void *user_data)
{
xml_node_private_t *nodepriv = xml->_private;
if (nodepriv != NULL) {
pcmk__set_xml_flags(nodepriv, pcmk__xf_dirty|pcmk__xf_created);
}
return true;
}
/*!
* \internal
* \brief Mark an XML tree as dirty and created, and mark its parents dirty
*
* Also mark the document dirty.
*
* \param[in,out] xml Tree to mark as dirty and created
*/
static void
mark_xml_tree_dirty_created(xmlNode *xml)
{
pcmk__assert(xml != NULL);
if (!pcmk__xml_doc_all_flags_set(xml->doc, pcmk__xf_tracking)) {
// Tracking is disabled for entire document
return;
}
// Mark all parents and document dirty
pcmk__mark_xml_node_dirty(xml);
pcmk__xml_tree_foreach(xml, mark_xml_dirty_created, NULL);
}
// Free an XML object previously marked as deleted
static void
free_deleted_object(void *data)
{
if(data) {
pcmk__deleted_xml_t *deleted_obj = data;
g_free(deleted_obj->path);
free(deleted_obj);
}
}
// Free and NULL user, ACLs, and deleted objects in an XML node's private data
static void
reset_xml_private_data(xml_doc_private_t *docpriv)
{
if (docpriv != NULL) {
pcmk__assert(docpriv->check == PCMK__XML_DOC_PRIVATE_MAGIC);
pcmk__str_update(&(docpriv->acl_user), NULL);
if (docpriv->acls != NULL) {
pcmk__free_acls(docpriv->acls);
docpriv->acls = NULL;
}
if(docpriv->deleted_objs) {
g_list_free_full(docpriv->deleted_objs, free_deleted_object);
docpriv->deleted_objs = NULL;
}
}
}
/*!
* \internal
* \brief Allocate and initialize private data for an XML node
*
* \param[in,out] node XML node whose private data to initialize
* \param[in] user_data Ignored
*
* \return \c true (to continue traversing the tree)
*
* \note This is compatible with \c pcmk__xml_tree_foreach().
*/
static bool
new_private_data(xmlNode *node, void *user_data)
{
bool tracking = false;
CRM_CHECK(node != NULL, return true);
if (node->_private != NULL) {
return true;
}
tracking = pcmk__xml_doc_all_flags_set(node->doc, pcmk__xf_tracking);
switch (node->type) {
case XML_DOCUMENT_NODE:
{
xml_doc_private_t *docpriv =
pcmk__assert_alloc(1, sizeof(xml_doc_private_t));
docpriv->check = PCMK__XML_DOC_PRIVATE_MAGIC;
node->_private = docpriv;
}
break;
case XML_ELEMENT_NODE:
case XML_ATTRIBUTE_NODE:
case XML_COMMENT_NODE:
{
xml_node_private_t *nodepriv =
pcmk__assert_alloc(1, sizeof(xml_node_private_t));
nodepriv->check = PCMK__XML_NODE_PRIVATE_MAGIC;
node->_private = nodepriv;
if (tracking) {
pcmk__set_xml_flags(nodepriv, pcmk__xf_dirty|pcmk__xf_created);
}
for (xmlAttr *iter = pcmk__xe_first_attr(node); iter != NULL;
iter = iter->next) {
new_private_data((xmlNode *) iter, user_data);
}
}
break;
case XML_TEXT_NODE:
case XML_DTD_NODE:
case XML_CDATA_SECTION_NODE:
return true;
default:
CRM_LOG_ASSERT(node->type == XML_ELEMENT_NODE);
return true;
}
if (tracking) {
pcmk__mark_xml_node_dirty(node);
}
return true;
}
/*!
* \internal
* \brief Free private data for an XML node
*
* \param[in,out] node XML node whose private data to free
* \param[in] user_data Ignored
*
* \return \c true (to continue traversing the tree)
*
* \note This is compatible with \c pcmk__xml_tree_foreach().
*/
static bool
free_private_data(xmlNode *node, void *user_data)
{
CRM_CHECK(node != NULL, return true);
if (node->_private == NULL) {
return true;
}
if (node->type == XML_DOCUMENT_NODE) {
reset_xml_private_data((xml_doc_private_t *) node->_private);
} else {
xml_node_private_t *nodepriv = node->_private;
pcmk__assert(nodepriv->check == PCMK__XML_NODE_PRIVATE_MAGIC);
for (xmlAttr *iter = pcmk__xe_first_attr(node); iter != NULL;
iter = iter->next) {
free_private_data((xmlNode *) iter, user_data);
}
}
free(node->_private);
node->_private = NULL;
return true;
}
/*!
* \internal
* \brief Allocate and initialize private data recursively for an XML tree
*
* \param[in,out] node XML node whose private data to initialize
*/
void
pcmk__xml_new_private_data(xmlNode *xml)
{
pcmk__xml_tree_foreach(xml, new_private_data, NULL);
}
/*!
* \internal
* \brief Free private data recursively for an XML tree
*
* \param[in,out] node XML node whose private data to free
*/
void
pcmk__xml_free_private_data(xmlNode *xml)
{
pcmk__xml_tree_foreach(xml, free_private_data, NULL);
}
/*!
* \internal
* \brief Return ordinal position of an XML node among its siblings
*
* \param[in] xml XML node to check
* \param[in] ignore_if_set Don't count siblings with this flag set
*
* \return Ordinal position of \p xml (starting with 0)
*/
int
pcmk__xml_position(const xmlNode *xml, enum pcmk__xml_flags ignore_if_set)
{
int position = 0;
for (const xmlNode *cIter = xml; cIter->prev; cIter = cIter->prev) {
xml_node_private_t *nodepriv = ((xmlNode*)cIter->prev)->_private;
if (!pcmk_is_set(nodepriv->flags, ignore_if_set)) {
position++;
}
}
return position;
}
/*!
* \internal
* \brief Remove all attributes marked as deleted from an XML node
*
* \param[in,out] xml XML node whose deleted attributes to remove
* \param[in,out] user_data Ignored
*
* \return \c true (to continue traversing the tree)
*
* \note This is compatible with \c pcmk__xml_tree_foreach().
*/
static bool
commit_attr_deletions(xmlNode *xml, void *user_data)
{
pcmk__xml_reset_node_flags(xml, NULL);
pcmk__xe_remove_matching_attrs(xml, true, pcmk__marked_as_deleted, NULL);
return true;
}
/*!
* \internal
* \brief Finalize all pending changes to an XML document and reset private data
*
* Clear the ACL user and all flags, unpacked ACLs, and deleted node records for
* the document; clear all flags on each node in the tree; and delete any
* attributes that are marked for deletion.
*
* \param[in,out] doc XML document
*
* \note When change tracking is enabled, "deleting" an attribute simply marks
* it for deletion (using \c pcmk__xf_deleted) until changes are
* committed. Freeing a node (using \c pcmk__xml_free()) adds a deleted
* node record (\c pcmk__deleted_xml_t) to the node's document before
* freeing it.
* \note This function clears all flags, not just flags that indicate changes.
* In particular, note that it clears the \c pcmk__xf_tracking flag, thus
* disabling tracking.
*/
void
pcmk__xml_commit_changes(xmlDoc *doc)
{
xml_doc_private_t *docpriv = NULL;
if (doc == NULL) {
return;
}
docpriv = doc->_private;
if (docpriv == NULL) {
return;
}
if (pcmk_is_set(docpriv->flags, pcmk__xf_dirty)) {
pcmk__xml_tree_foreach(xmlDocGetRootElement(doc), commit_attr_deletions,
NULL);
}
reset_xml_private_data(docpriv);
docpriv->flags = pcmk__xf_none;
}
/*!
* \internal
* \brief Find first child XML node matching another given XML node
*
* \param[in] haystack XML whose children should be checked
* \param[in] needle XML to match (comment content or element name and ID)
*/
static xmlNode *
match_xml(const xmlNode *haystack, const xmlNode *needle)
{
CRM_CHECK(needle != NULL, return NULL);
if (needle->type == XML_COMMENT_NODE) {
- return pcmk__xc_match(haystack, needle, true);
+ return pcmk__xc_match_child(haystack, needle, true);
} else {
const char *id = pcmk__xe_id(needle);
const char *attr = (id == NULL)? NULL : PCMK_XA_ID;
return pcmk__xe_first_child(haystack, (const char *) needle->name, attr,
id);
}
}
/*!
* \internal
* \brief Create a new XML document
*
* \return Newly allocated XML document (guaranteed not to be \c NULL)
*
* \note The caller is responsible for freeing the return value using
* \c pcmk__xml_free_doc().
*/
xmlDoc *
pcmk__xml_new_doc(void)
{
xmlDoc *doc = xmlNewDoc(XML_VERSION);
pcmk__mem_assert(doc);
pcmk__xml_new_private_data((xmlNode *) doc);
return doc;
}
/*!
* \internal
* \brief Free a new XML document
*
* \param[in,out] doc XML document to free
*/
void
pcmk__xml_free_doc(xmlDoc *doc)
{
if (doc != NULL) {
pcmk__xml_free_private_data((xmlNode *) doc);
xmlFreeDoc(doc);
}
}
/*!
* \internal
* \brief Check whether the first character of a string is an XML NameStartChar
*
* See https://www.w3.org/TR/xml/#NT-NameStartChar.
*
* This is almost identical to libxml2's \c xmlIsDocNameStartChar(), but they
* don't expose it as part of the public API.
*
* \param[in] utf8 UTF-8 encoded string
* \param[out] len If not \c NULL, where to store size in bytes of first
* character in \p utf8
*
* \return \c true if \p utf8 begins with a valid XML NameStartChar, or \c false
* otherwise
*/
bool
pcmk__xml_is_name_start_char(const char *utf8, int *len)
{
int c = 0;
int local_len = 0;
if (len == NULL) {
len = &local_len;
}
/* xmlGetUTF8Char() abuses the len argument. At call time, it must be set to
* "the minimum number of bytes present in the sequence... to assure the
* next character is completely contained within the sequence." It's similar
* to the "n" in the strn*() functions. However, this doesn't make any sense
* for null-terminated strings, and there's no value that indicates "keep
* going until '\0'." So we set it to 4, the max number of bytes in a UTF-8
* character.
*
* At return, it's set to the actual number of bytes in the char, or 0 on
* error.
*/
*len = 4;
// Note: xmlGetUTF8Char() assumes a 32-bit int
c = xmlGetUTF8Char((const xmlChar *) utf8, len);
if (c < 0) {
GString *buf = g_string_sized_new(32);
for (int i = 0; (i < 4) && (utf8[i] != '\0'); i++) {
g_string_append_printf(buf, " 0x%.2X", utf8[i]);
}
crm_info("Invalid UTF-8 character (bytes:%s)",
(pcmk__str_empty(buf->str)? " <none>" : buf->str));
g_string_free(buf, TRUE);
return false;
}
return (c == '_')
|| (c == ':')
|| ((c >= 'a') && (c <= 'z'))
|| ((c >= 'A') && (c <= 'Z'))
|| ((c >= 0xC0) && (c <= 0xD6))
|| ((c >= 0xD8) && (c <= 0xF6))
|| ((c >= 0xF8) && (c <= 0x2FF))
|| ((c >= 0x370) && (c <= 0x37D))
|| ((c >= 0x37F) && (c <= 0x1FFF))
|| ((c >= 0x200C) && (c <= 0x200D))
|| ((c >= 0x2070) && (c <= 0x218F))
|| ((c >= 0x2C00) && (c <= 0x2FEF))
|| ((c >= 0x3001) && (c <= 0xD7FF))
|| ((c >= 0xF900) && (c <= 0xFDCF))
|| ((c >= 0xFDF0) && (c <= 0xFFFD))
|| ((c >= 0x10000) && (c <= 0xEFFFF));
}
/*!
* \internal
* \brief Check whether the first character of a string is an XML NameChar
*
* See https://www.w3.org/TR/xml/#NT-NameChar.
*
* This is almost identical to libxml2's \c xmlIsDocNameChar(), but they don't
* expose it as part of the public API.
*
* \param[in] utf8 UTF-8 encoded string
* \param[out] len If not \c NULL, where to store size in bytes of first
* character in \p utf8
*
* \return \c true if \p utf8 begins with a valid XML NameChar, or \c false
* otherwise
*/
bool
pcmk__xml_is_name_char(const char *utf8, int *len)
{
int c = 0;
int local_len = 0;
if (len == NULL) {
len = &local_len;
}
// See comment regarding len in pcmk__xml_is_name_start_char()
*len = 4;
// Note: xmlGetUTF8Char() assumes a 32-bit int
c = xmlGetUTF8Char((const xmlChar *) utf8, len);
if (c < 0) {
GString *buf = g_string_sized_new(32);
for (int i = 0; (i < 4) && (utf8[i] != '\0'); i++) {
g_string_append_printf(buf, " 0x%.2X", utf8[i]);
}
crm_info("Invalid UTF-8 character (bytes:%s)",
(pcmk__str_empty(buf->str)? " <none>" : buf->str));
g_string_free(buf, TRUE);
return false;
}
return ((c >= 'a') && (c <= 'z'))
|| ((c >= 'A') && (c <= 'Z'))
|| ((c >= '0') && (c <= '9'))
|| (c == '_')
|| (c == ':')
|| (c == '-')
|| (c == '.')
|| (c == 0xB7)
|| ((c >= 0xC0) && (c <= 0xD6))
|| ((c >= 0xD8) && (c <= 0xF6))
|| ((c >= 0xF8) && (c <= 0x2FF))
|| ((c >= 0x300) && (c <= 0x36F))
|| ((c >= 0x370) && (c <= 0x37D))
|| ((c >= 0x37F) && (c <= 0x1FFF))
|| ((c >= 0x200C) && (c <= 0x200D))
|| ((c >= 0x203F) && (c <= 0x2040))
|| ((c >= 0x2070) && (c <= 0x218F))
|| ((c >= 0x2C00) && (c <= 0x2FEF))
|| ((c >= 0x3001) && (c <= 0xD7FF))
|| ((c >= 0xF900) && (c <= 0xFDCF))
|| ((c >= 0xFDF0) && (c <= 0xFFFD))
|| ((c >= 0x10000) && (c <= 0xEFFFF));
}
/*!
* \internal
* \brief Sanitize a string so it is usable as an XML ID
*
* An ID must match the Name production as defined here:
* https://www.w3.org/TR/xml/#NT-Name.
*
* Convert an invalid start character to \c '_'. Convert an invalid character
* after the start character to \c '.'.
*
* \param[in,out] id String to sanitize
*/
void
pcmk__xml_sanitize_id(char *id)
{
bool valid = true;
int len = 0;
// If id is empty or NULL, there's no way to make it a valid XML ID
pcmk__assert(!pcmk__str_empty(id));
/* @TODO Suppose there are two strings and each has an invalid ID character
* in the same position. The strings are otherwise identical. Both strings
* will be sanitized to the same valid ID, which is incorrect.
*
* The caller is responsible for ensuring the sanitized ID does not already
* exist in a given XML document before using it, if uniqueness is desired.
*/
valid = pcmk__xml_is_name_start_char(id, &len);
CRM_CHECK(len > 0, return); // UTF-8 encoding error
if (!valid) {
*id = '_';
for (int i = 1; i < len; i++) {
id[i] = '.';
}
}
for (id += len; *id != '\0'; id += len) {
valid = pcmk__xml_is_name_char(id, &len);
CRM_CHECK(len > 0, return); // UTF-8 encoding error
if (!valid) {
for (int i = 0; i < len; i++) {
id[i] = '.';
}
}
}
}
/*!
* \internal
* \brief Free an XML tree without ACL checks or change tracking
*
* \param[in,out] xml XML node to free
*/
void
pcmk__xml_free_node(xmlNode *xml)
{
pcmk__xml_free_private_data(xml);
xmlUnlinkNode(xml);
xmlFreeNode(xml);
}
/*!
* \internal
* \brief Free an XML tree if ACLs allow; track deletion if tracking is enabled
*
* If \p node is the root of its document, free the entire document.
*
* \param[in,out] node XML node to free
* \param[in] position Position of \p node among its siblings for change
* tracking (negative to calculate automatically if
* needed)
*/
static void
free_xml_with_position(xmlNode *node, int position)
{
xmlDoc *doc = NULL;
xml_node_private_t *nodepriv = NULL;
if (node == NULL) {
return;
}
doc = node->doc;
nodepriv = node->_private;
if ((doc != NULL) && (xmlDocGetRootElement(doc) == node)) {
/* @TODO Should we check ACLs first? Otherwise it seems like we could
* free the root element without write permission.
*/
pcmk__xml_free_doc(doc);
return;
}
if (!pcmk__check_acl(node, NULL, pcmk__xf_acl_write)) {
GString *xpath = NULL;
pcmk__if_tracing({}, return);
xpath = pcmk__element_xpath(node);
qb_log_from_external_source(__func__, __FILE__,
"Cannot remove %s %x", LOG_TRACE,
__LINE__, 0, xpath->str, nodepriv->flags);
g_string_free(xpath, TRUE);
return;
}
if (pcmk__xml_doc_all_flags_set(node->doc, pcmk__xf_tracking)
&& !pcmk_is_set(nodepriv->flags, pcmk__xf_created)) {
xml_doc_private_t *docpriv = doc->_private;
GString *xpath = pcmk__element_xpath(node);
if (xpath != NULL) {
pcmk__deleted_xml_t *deleted_obj = NULL;
crm_trace("Deleting %s %p from %p", xpath->str, node, doc);
deleted_obj = pcmk__assert_alloc(1, sizeof(pcmk__deleted_xml_t));
deleted_obj->path = g_string_free(xpath, FALSE);
deleted_obj->position = -1;
// Record the position only for XML comments for now
if (node->type == XML_COMMENT_NODE) {
if (position >= 0) {
deleted_obj->position = position;
} else {
deleted_obj->position = pcmk__xml_position(node,
pcmk__xf_skip);
}
}
docpriv->deleted_objs = g_list_append(docpriv->deleted_objs,
deleted_obj);
pcmk__xml_doc_set_flags(node->doc, pcmk__xf_dirty);
}
}
pcmk__xml_free_node(node);
}
/*!
* \internal
* \brief Free an XML tree if ACLs allow; track deletion if tracking is enabled
*
* If \p xml is the root of its document, free the entire document.
*
* \param[in,out] xml XML node to free
*/
void
pcmk__xml_free(xmlNode *xml)
{
free_xml_with_position(xml, -1);
}
/*!
* \internal
* \brief Make a deep copy of an XML node under a given parent
*
* \param[in,out] parent XML element that will be the copy's parent (\c NULL
* to create a new XML document with the copy as root)
* \param[in] src XML node to copy
*
* \return Deep copy of \p src, or \c NULL if \p src is \c NULL
*/
xmlNode *
pcmk__xml_copy(xmlNode *parent, xmlNode *src)
{
xmlNode *copy = NULL;
if (src == NULL) {
return NULL;
}
if (parent == NULL) {
xmlDoc *doc = NULL;
// The copy will be the root element of a new document
pcmk__assert(src->type == XML_ELEMENT_NODE);
doc = pcmk__xml_new_doc();
copy = xmlDocCopyNode(src, doc, 1);
pcmk__mem_assert(copy);
xmlDocSetRootElement(doc, copy);
} else {
copy = xmlDocCopyNode(src, parent->doc, 1);
pcmk__mem_assert(copy);
xmlAddChild(parent, copy);
}
pcmk__xml_new_private_data(copy);
return copy;
}
/*!
* \internal
* \brief Remove XML text nodes from specified XML and all its children
*
* \param[in,out] xml XML to strip text from
*/
void
pcmk__strip_xml_text(xmlNode *xml)
{
xmlNode *iter = xml->children;
while (iter) {
xmlNode *next = iter->next;
switch (iter->type) {
case XML_TEXT_NODE:
pcmk__xml_free_node(iter);
break;
case XML_ELEMENT_NODE:
/* Search it */
pcmk__strip_xml_text(iter);
break;
default:
/* Leave it */
break;
}
iter = next;
}
}
/*!
* \internal
* \brief Check whether a string has XML special characters that must be escaped
*
* See \c pcmk__xml_escape() and \c pcmk__xml_escape_type for more details.
*
* \param[in] text String to check
* \param[in] type Type of escaping
*
* \return \c true if \p text has special characters that need to be escaped, or
* \c false otherwise
*/
bool
pcmk__xml_needs_escape(const char *text, enum pcmk__xml_escape_type type)
{
if (text == NULL) {
return false;
}
while (*text != '\0') {
switch (type) {
case pcmk__xml_escape_text:
switch (*text) {
case '<':
case '>':
case '&':
return true;
case '\n':
case '\t':
break;
default:
if (g_ascii_iscntrl(*text)) {
return true;
}
break;
}
break;
case pcmk__xml_escape_attr:
switch (*text) {
case '<':
case '>':
case '&':
case '"':
return true;
default:
if (g_ascii_iscntrl(*text)) {
return true;
}
break;
}
break;
case pcmk__xml_escape_attr_pretty:
switch (*text) {
case '\n':
case '\r':
case '\t':
case '"':
return true;
default:
break;
}
break;
default: // Invalid enum value
pcmk__assert(false);
break;
}
text = g_utf8_next_char(text);
}
return false;
}
/*!
* \internal
* \brief Replace special characters with their XML escape sequences
*
* \param[in] text Text to escape
* \param[in] type Type of escaping
*
* \return Newly allocated string equivalent to \p text but with special
* characters replaced with XML escape sequences (or \c NULL if \p text
* is \c NULL). If \p text is not \c NULL, the return value is
* guaranteed not to be \c NULL.
*
* \note There are libxml functions that purport to do this:
* \c xmlEncodeEntitiesReentrant() and \c xmlEncodeSpecialChars().
* However, their escaping is incomplete. See:
* https://discourse.gnome.org/t/intended-use-of-xmlencodeentitiesreentrant-vs-xmlencodespecialchars/19252
* \note The caller is responsible for freeing the return value using
* \c g_free().
*/
gchar *
pcmk__xml_escape(const char *text, enum pcmk__xml_escape_type type)
{
GString *copy = NULL;
if (text == NULL) {
return NULL;
}
copy = g_string_sized_new(strlen(text));
while (*text != '\0') {
// Don't escape any non-ASCII characters
if ((*text & 0x80) != 0) {
size_t bytes = g_utf8_next_char(text) - text;
g_string_append_len(copy, text, bytes);
text += bytes;
continue;
}
switch (type) {
case pcmk__xml_escape_text:
switch (*text) {
case '<':
g_string_append(copy, PCMK__XML_ENTITY_LT);
break;
case '>':
g_string_append(copy, PCMK__XML_ENTITY_GT);
break;
case '&':
g_string_append(copy, PCMK__XML_ENTITY_AMP);
break;
case '\n':
case '\t':
g_string_append_c(copy, *text);
break;
default:
if (g_ascii_iscntrl(*text)) {
g_string_append_printf(copy, "&#x%.2X;", *text);
} else {
g_string_append_c(copy, *text);
}
break;
}
break;
case pcmk__xml_escape_attr:
switch (*text) {
case '<':
g_string_append(copy, PCMK__XML_ENTITY_LT);
break;
case '>':
g_string_append(copy, PCMK__XML_ENTITY_GT);
break;
case '&':
g_string_append(copy, PCMK__XML_ENTITY_AMP);
break;
case '"':
g_string_append(copy, PCMK__XML_ENTITY_QUOT);
break;
default:
if (g_ascii_iscntrl(*text)) {
g_string_append_printf(copy, "&#x%.2X;", *text);
} else {
g_string_append_c(copy, *text);
}
break;
}
break;
case pcmk__xml_escape_attr_pretty:
switch (*text) {
case '"':
g_string_append(copy, "\\\"");
break;
case '\n':
g_string_append(copy, "\\n");
break;
case '\r':
g_string_append(copy, "\\r");
break;
case '\t':
g_string_append(copy, "\\t");
break;
default:
g_string_append_c(copy, *text);
break;
}
break;
default: // Invalid enum value
pcmk__assert(false);
break;
}
text = g_utf8_next_char(text);
}
return g_string_free(copy, FALSE);
}
/*!
* \internal
* \brief Add an XML attribute to a node, marked as deleted
*
* When calculating XML changes, we need to know when an attribute has been
* deleted. Add the attribute back to the new XML, so that we can check the
* removal against ACLs, and mark it as deleted for later removal after
* differences have been calculated.
*
* \param[in,out] new_xml XML to modify
* \param[in] element Name of XML element that changed (for logging)
* \param[in] attr_name Name of attribute that was deleted
* \param[in] old_value Value of attribute that was deleted
*/
static void
mark_attr_deleted(xmlNode *new_xml, const char *element, const char *attr_name,
const char *old_value)
{
xml_doc_private_t *docpriv = new_xml->doc->_private;
xmlAttr *attr = NULL;
xml_node_private_t *nodepriv;
/* Restore the old value (without setting dirty flag recursively upwards or
* checking ACLs)
*/
pcmk__clear_xml_flags(docpriv, pcmk__xf_tracking);
crm_xml_add(new_xml, attr_name, old_value);
pcmk__set_xml_flags(docpriv, pcmk__xf_tracking);
// Reset flags (so the attribute doesn't appear as newly created)
attr = xmlHasProp(new_xml, (const xmlChar *) attr_name);
nodepriv = attr->_private;
nodepriv->flags = 0;
// Check ACLs and mark restored value for later removal
pcmk__xa_remove(attr, false);
crm_trace("XML attribute %s=%s was removed from %s",
attr_name, old_value, element);
}
/*
* \internal
* \brief Check ACLs for a changed XML attribute
*/
static void
mark_attr_changed(xmlNode *new_xml, const char *element, const char *attr_name,
const char *old_value)
{
xml_doc_private_t *docpriv = new_xml->doc->_private;
char *vcopy = crm_element_value_copy(new_xml, attr_name);
crm_trace("XML attribute %s was changed from '%s' to '%s' in %s",
attr_name, old_value, vcopy, element);
// Restore the original value (without checking ACLs)
pcmk__clear_xml_flags(docpriv, pcmk__xf_tracking);
crm_xml_add(new_xml, attr_name, old_value);
pcmk__set_xml_flags(docpriv, pcmk__xf_tracking);
// Change it back to the new value, to check ACLs
crm_xml_add(new_xml, attr_name, vcopy);
free(vcopy);
}
/*!
* \internal
* \brief Mark an XML attribute as having changed position
*
* \param[in,out] new_xml XML to modify
* \param[in] element Name of XML element that changed (for logging)
* \param[in,out] old_attr Attribute that moved, in original XML
* \param[in,out] new_attr Attribute that moved, in \p new_xml
* \param[in] p_old Ordinal position of \p old_attr in original XML
* \param[in] p_new Ordinal position of \p new_attr in \p new_xml
*/
static void
mark_attr_moved(xmlNode *new_xml, const char *element, xmlAttr *old_attr,
xmlAttr *new_attr, int p_old, int p_new)
{
xml_node_private_t *nodepriv = new_attr->_private;
crm_trace("XML attribute %s moved from position %d to %d in %s",
old_attr->name, p_old, p_new, element);
// Mark document, element, and all element's parents as changed
pcmk__mark_xml_node_dirty(new_xml);
// Mark attribute as changed
pcmk__set_xml_flags(nodepriv, pcmk__xf_dirty|pcmk__xf_moved);
nodepriv = (p_old > p_new)? old_attr->_private : new_attr->_private;
pcmk__set_xml_flags(nodepriv, pcmk__xf_skip);
}
/*!
* \internal
* \brief Calculate differences in all previously existing XML attributes
*
* \param[in,out] old_xml Original XML to compare
* \param[in,out] new_xml New XML to compare
*/
static void
xml_diff_old_attrs(xmlNode *old_xml, xmlNode *new_xml)
{
xmlAttr *attr_iter = pcmk__xe_first_attr(old_xml);
while (attr_iter != NULL) {
const char *name = (const char *) attr_iter->name;
xmlAttr *old_attr = attr_iter;
xmlAttr *new_attr = xmlHasProp(new_xml, attr_iter->name);
const char *old_value = pcmk__xml_attr_value(attr_iter);
attr_iter = attr_iter->next;
if (new_attr == NULL) {
mark_attr_deleted(new_xml, (const char *) old_xml->name, name,
old_value);
} else {
xml_node_private_t *nodepriv = new_attr->_private;
int new_pos = pcmk__xml_position((xmlNode*) new_attr,
pcmk__xf_skip);
int old_pos = pcmk__xml_position((xmlNode*) old_attr,
pcmk__xf_skip);
const char *new_value = crm_element_value(new_xml, name);
// This attribute isn't new
pcmk__clear_xml_flags(nodepriv, pcmk__xf_created);
if (strcmp(new_value, old_value) != 0) {
mark_attr_changed(new_xml, (const char *) old_xml->name, name,
old_value);
} else if ((old_pos != new_pos)
&& !pcmk__xml_doc_all_flags_set(new_xml->doc,
pcmk__xf_ignore_attr_pos
|pcmk__xf_tracking)) {
/* pcmk__xf_tracking is always set by xml_calculate_changes()
* before this function is called, so only the
* pcmk__xf_ignore_attr_pos check is truly relevant.
*/
mark_attr_moved(new_xml, (const char *) old_xml->name,
old_attr, new_attr, old_pos, new_pos);
}
}
}
}
/*!
* \internal
* \brief Check all attributes in new XML for creation
*
* For each of a given XML element's attributes marked as newly created, accept
* (and mark as dirty) or reject the creation according to ACLs.
*
* \param[in,out] new_xml XML to check
*/
static void
mark_created_attrs(xmlNode *new_xml)
{
xmlAttr *attr_iter = pcmk__xe_first_attr(new_xml);
while (attr_iter != NULL) {
xmlAttr *new_attr = attr_iter;
xml_node_private_t *nodepriv = attr_iter->_private;
attr_iter = attr_iter->next;
if (pcmk_is_set(nodepriv->flags, pcmk__xf_created)) {
const char *attr_name = (const char *) new_attr->name;
crm_trace("Created new attribute %s=%s in %s",
attr_name, pcmk__xml_attr_value(new_attr),
new_xml->name);
/* Check ACLs (we can't use the remove-then-create trick because it
* would modify the attribute position).
*/
if (pcmk__check_acl(new_xml, attr_name, pcmk__xf_acl_write)) {
pcmk__mark_xml_attr_dirty(new_attr);
} else {
// Creation was not allowed, so remove the attribute
pcmk__xa_remove(new_attr, true);
}
}
}
}
/*!
* \internal
* \brief Calculate differences in attributes between two XML nodes
*
* \param[in,out] old_xml Original XML to compare
* \param[in,out] new_xml New XML to compare
*/
static void
xml_diff_attrs(xmlNode *old_xml, xmlNode *new_xml)
{
// Cleared later if attributes are not really new
for (xmlAttr *attr = pcmk__xe_first_attr(new_xml); attr != NULL;
attr = attr->next) {
xml_node_private_t *nodepriv = attr->_private;
pcmk__set_xml_flags(nodepriv, pcmk__xf_created);
}
xml_diff_old_attrs(old_xml, new_xml);
mark_created_attrs(new_xml);
}
/*!
* \internal
* \brief Add an XML child element to a node, marked as deleted
*
* When calculating XML changes, we need to know when a child element has been
* deleted. Add the child back to the new XML, so that we can check the removal
* against ACLs, and mark it as deleted for later removal after differences have
* been calculated.
*
* \param[in,out] old_child Child element from original XML
* \param[in,out] new_parent New XML to add marked copy to
*/
static void
mark_child_deleted(xmlNode *old_child, xmlNode *new_parent)
{
// Re-create the child element so we can check ACLs
xmlNode *candidate = pcmk__xml_copy(new_parent, old_child);
// Clear flags on new child and its children
pcmk__xml_tree_foreach(candidate, pcmk__xml_reset_node_flags, NULL);
// Check whether ACLs allow the deletion
pcmk__apply_acl(xmlDocGetRootElement(candidate->doc));
// Remove the child again (which will track it in document's deleted_objs)
free_xml_with_position(candidate,
pcmk__xml_position(old_child, pcmk__xf_skip));
pcmk__set_xml_flags((xml_node_private_t *) old_child->_private,
pcmk__xf_skip);
}
static void
mark_child_moved(xmlNode *old_child, xmlNode *new_parent, xmlNode *new_child,
int p_old, int p_new)
{
xml_node_private_t *nodepriv = new_child->_private;
crm_trace("Child element %s with "
PCMK_XA_ID "='%s' moved from position %d to %d under %s",
new_child->name, pcmk__s(pcmk__xe_id(new_child), "<no id>"),
p_old, p_new, new_parent->name);
pcmk__mark_xml_node_dirty(new_parent);
pcmk__set_xml_flags(nodepriv, pcmk__xf_moved);
if (p_old > p_new) {
nodepriv = old_child->_private;
} else {
nodepriv = new_child->_private;
}
pcmk__set_xml_flags(nodepriv, pcmk__xf_skip);
}
// Given original and new XML, mark new XML portions that have changed
static void
mark_xml_changes(xmlNode *old_xml, xmlNode *new_xml)
{
xml_node_private_t *nodepriv = NULL;
CRM_CHECK(new_xml != NULL, return);
nodepriv = new_xml->_private;
CRM_CHECK(nodepriv != NULL, return);
if (pcmk_is_set(nodepriv->flags, pcmk__xf_processed)) {
// Avoid re-comparing nodes
return;
}
pcmk__set_xml_flags(nodepriv, pcmk__xf_processed);
xml_diff_attrs(old_xml, new_xml);
// Check for differences compared to the original children
for (xmlNode *old_child = pcmk__xml_first_child(old_xml); old_child != NULL;
old_child = pcmk__xml_next(old_child)) {
xmlNode *new_child = match_xml(new_xml, old_child);
if (new_child != NULL) {
mark_xml_changes(old_child, new_child);
} else {
mark_child_deleted(old_child, new_xml);
}
}
// Check for moved or created children
for (xmlNode *new_child = pcmk__xml_first_child(new_xml),
*next = pcmk__xml_next(new_child);
new_child != NULL;
new_child = next, next = pcmk__xml_next(new_child)) {
xmlNode *old_child = match_xml(old_xml, new_child);
if (old_child != NULL) {
// Check for movement; we already marked other changes
int old_pos = pcmk__xml_position(old_child, pcmk__xf_skip);
int new_pos = pcmk__xml_position(new_child, pcmk__xf_skip);
if (old_pos != new_pos) {
mark_child_moved(old_child, new_xml, new_child, old_pos,
new_pos);
}
} else {
// This is a newly created child
nodepriv = new_child->_private;
pcmk__set_xml_flags(nodepriv, pcmk__xf_skip);
mark_xml_tree_dirty_created(new_child);
// Check whether creation was allowed; may free new_child
pcmk__apply_creation_acl(new_child, true);
}
}
}
void
xml_calculate_significant_changes(xmlNode *old_xml, xmlNode *new_xml)
{
if (new_xml != NULL) {
/* BUG: If pcmk__xf_tracking is not set for new_xml when this function
* is called, then xml_calculate_changes() will unset
* pcmk__xf_ignore_attr_pos because pcmk__xml_commit_changes() will be
* in the call chain.
*/
pcmk__xml_doc_set_flags(new_xml->doc, pcmk__xf_ignore_attr_pos);
}
xml_calculate_changes(old_xml, new_xml);
}
// Called functions may set the \p pcmk__xf_skip flag on parts of \p old_xml
void
xml_calculate_changes(xmlNode *old_xml, xmlNode *new_xml)
{
CRM_CHECK((old_xml != NULL) && (new_xml != NULL)
&& pcmk__xe_is(old_xml, (const char *) new_xml->name)
&& pcmk__str_eq(pcmk__xe_id(old_xml), pcmk__xe_id(new_xml),
pcmk__str_none),
return);
if (!pcmk__xml_doc_all_flags_set(new_xml->doc, pcmk__xf_tracking)) {
// Ensure tracking has a clean start
pcmk__xml_commit_changes(new_xml->doc);
pcmk__xml_doc_set_flags(new_xml->doc, pcmk__xf_tracking);
}
mark_xml_changes(old_xml, new_xml);
}
/*!
* \internal
* \brief Initialize the Pacemaker XML environment
*
* Set an XML buffer allocation scheme, set XML node create and destroy
* callbacks, and load schemas into the cache.
*/
void
pcmk__xml_init(void)
{
// @TODO Try to find a better caller than crm_log_preinit()
static bool initialized = false;
if (!initialized) {
initialized = true;
/* Double the buffer size when the buffer needs to grow. The default
* allocator XML_BUFFER_ALLOC_EXACT was found to cause poor performance
* due to the number of reallocs.
*/
xmlSetBufferAllocationScheme(XML_BUFFER_ALLOC_DOUBLEIT);
// Load schemas into the cache
pcmk__schema_init();
}
}
/*!
* \internal
* \brief Tear down the Pacemaker XML environment
*
* Destroy schema cache and clean up memory allocated by libxml2.
*/
void
pcmk__xml_cleanup(void)
{
pcmk__schema_cleanup();
xmlCleanupParser();
}
char *
pcmk__xml_artefact_root(enum pcmk__xml_artefact_ns ns)
{
static const char *base = NULL;
char *ret = NULL;
if (base == NULL) {
base = pcmk__env_option(PCMK__ENV_SCHEMA_DIRECTORY);
}
if (pcmk__str_empty(base)) {
base = PCMK_SCHEMA_DIR;
}
switch (ns) {
case pcmk__xml_artefact_ns_legacy_rng:
case pcmk__xml_artefact_ns_legacy_xslt:
ret = strdup(base);
break;
case pcmk__xml_artefact_ns_base_rng:
case pcmk__xml_artefact_ns_base_xslt:
ret = crm_strdup_printf("%s/base", base);
break;
default:
crm_err("XML artefact family specified as %u not recognized", ns);
}
return ret;
}
static char *
find_artefact(enum pcmk__xml_artefact_ns ns, const char *path, const char *filespec)
{
char *ret = NULL;
switch (ns) {
case pcmk__xml_artefact_ns_legacy_rng:
case pcmk__xml_artefact_ns_base_rng:
if (pcmk__ends_with(filespec, ".rng")) {
ret = crm_strdup_printf("%s/%s", path, filespec);
} else {
ret = crm_strdup_printf("%s/%s.rng", path, filespec);
}
break;
case pcmk__xml_artefact_ns_legacy_xslt:
case pcmk__xml_artefact_ns_base_xslt:
if (pcmk__ends_with(filespec, ".xsl")) {
ret = crm_strdup_printf("%s/%s", path, filespec);
} else {
ret = crm_strdup_printf("%s/%s.xsl", path, filespec);
}
break;
default:
crm_err("XML artefact family specified as %u not recognized", ns);
}
return ret;
}
char *
pcmk__xml_artefact_path(enum pcmk__xml_artefact_ns ns, const char *filespec)
{
struct stat sb;
char *base = pcmk__xml_artefact_root(ns);
char *ret = NULL;
ret = find_artefact(ns, base, filespec);
free(base);
if (stat(ret, &sb) != 0 || !S_ISREG(sb.st_mode)) {
const char *remote_schema_dir = pcmk__remote_schema_dir();
free(ret);
ret = find_artefact(ns, remote_schema_dir, filespec);
}
return ret;
}
// Deprecated functions kept only for backward API compatibility
// LCOV_EXCL_START
#include <crm/common/xml_compat.h>
xmlNode *
copy_xml(xmlNode *src)
{
xmlDoc *doc = pcmk__xml_new_doc();
xmlNode *copy = NULL;
copy = xmlDocCopyNode(src, doc, 1);
pcmk__mem_assert(copy);
xmlDocSetRootElement(doc, copy);
pcmk__xml_new_private_data(copy);
return copy;
}
void
crm_xml_init(void)
{
pcmk__xml_init();
}
void
crm_xml_cleanup(void)
{
pcmk__xml_cleanup();
}
void
pcmk_free_xml_subtree(xmlNode *xml)
{
pcmk__xml_free_node(xml);
}
void
free_xml(xmlNode *child)
{
pcmk__xml_free(child);
}
void
crm_xml_sanitize_id(char *id)
{
char *c;
for (c = id; *c; ++c) {
switch (*c) {
case ':':
case '#':
*c = '.';
}
}
}
bool
xml_tracking_changes(xmlNode *xml)
{
return (xml != NULL)
&& pcmk__xml_doc_all_flags_set(xml->doc, pcmk__xf_tracking);
}
bool
xml_document_dirty(xmlNode *xml)
{
return (xml != NULL)
&& pcmk__xml_doc_all_flags_set(xml->doc, pcmk__xf_dirty);
}
void
xml_accept_changes(xmlNode *xml)
{
if (xml != NULL) {
pcmk__xml_commit_changes(xml->doc);
}
}
void
xml_track_changes(xmlNode *xml, const char *user, xmlNode *acl_source,
bool enforce_acls)
{
if (xml == NULL) {
return;
}
pcmk__xml_commit_changes(xml->doc);
crm_trace("Tracking changes%s to %p",
(enforce_acls? " with ACLs" : ""), xml);
pcmk__xml_doc_set_flags(xml->doc, pcmk__xf_tracking);
if (enforce_acls) {
if (acl_source == NULL) {
acl_source = xml;
}
pcmk__xml_doc_set_flags(xml->doc, pcmk__xf_acl_enabled);
pcmk__unpack_acl(acl_source, xml, user);
pcmk__apply_acl(xml);
}
}
// LCOV_EXCL_STOP
// End deprecated API
diff --git a/lib/common/xml_comment.c b/lib/common/xml_comment.c
index 2bc2848ef6..16c70d0167 100644
--- a/lib/common/xml_comment.c
+++ b/lib/common/xml_comment.c
@@ -1,116 +1,131 @@
/*
* Copyright 2024-2025 the Pacemaker project contributors
*
* The version control history for this file may have further details.
*
* This source code is licensed under the GNU Lesser General Public License
* version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
*/
#include <crm_internal.h>
+#include <stdbool.h> // bool, false
#include <stdio.h> // NULL
#include <libxml/tree.h> // xmlDoc, xmlNode, etc.
#include <libxml/xmlstring.h> // xmlChar
#include "crmcommon_private.h"
/*!
* \internal
* \brief Create a new XML comment belonging to a given document
*
* \param[in] doc Document that new comment will belong to
* \param[in] content Comment content
*
* \return Newly created XML comment (guaranteed not to be \c NULL)
*/
xmlNode *
pcmk__xc_create(xmlDoc *doc, const char *content)
{
xmlNode *node = NULL;
// Pacemaker typically assumes every xmlNode has a doc
pcmk__assert(doc != NULL);
node = xmlNewDocComment(doc, (const xmlChar *) content);
pcmk__mem_assert(node);
pcmk__xml_new_private_data(node);
return node;
}
/*!
* \internal
- * \brief Find a comment with matching content in specified XML
+ * \brief Find a comment with matching content among children of specified XML
*
- * \param[in] root XML to search
- * \param[in] search_comment Comment whose content should be searched for
- * \param[in] exact If true, comment must also be at same position
+ * \param[in] parent XML whose children to search
+ * \param[in] search Comment whose content should be searched for
+ * \param[in] exact If true, comment must also be at same position
+ *
+ * \return Matching comment, or \c NULL if no match is found
*/
xmlNode *
-pcmk__xc_match(const xmlNode *root, const xmlNode *search_comment, bool exact)
+pcmk__xc_match_child(const xmlNode *parent, const xmlNode *search, bool exact)
{
- xmlNode *a_child = NULL;
- int search_offset = pcmk__xml_position(search_comment, pcmk__xf_skip);
+ int search_pos = 0;
+
+ pcmk__assert((search != NULL) && (search->type == XML_COMMENT_NODE));
- CRM_CHECK(search_comment->type == XML_COMMENT_NODE, return NULL);
+ search_pos = pcmk__xml_position(search, pcmk__xf_skip);
+
+ for (xmlNode *child = pcmk__xml_first_child(parent); child != NULL;
+ child = pcmk__xml_next(child)) {
+
+ if (child->type != XML_COMMENT_NODE) {
+ continue;
+ }
- for (a_child = pcmk__xml_first_child(root); a_child != NULL;
- a_child = pcmk__xml_next(a_child)) {
if (exact) {
- int offset = pcmk__xml_position(a_child, pcmk__xf_skip);
- xml_node_private_t *nodepriv = a_child->_private;
+ int pos = 0;
+ xml_node_private_t *nodepriv = child->_private;
- if (offset < search_offset) {
+ if (pcmk_is_set(nodepriv->flags, pcmk__xf_skip)) {
continue;
-
- } else if (offset > search_offset) {
- return NULL;
}
- if (pcmk_is_set(nodepriv->flags, pcmk__xf_skip)) {
+ pos = pcmk__xml_position(child, pcmk__xf_skip);
+ if (pos < search_pos) {
+ // We have not yet reached the matching position
continue;
}
+ if (pos > search_pos) {
+ // We have already passed the matching position
+ return NULL;
+ }
+ // Position matches
}
- if (a_child->type == XML_COMMENT_NODE
- && pcmk__str_eq((const char *)a_child->content, (const char *)search_comment->content, pcmk__str_casei)) {
- return a_child;
+ if (pcmk__str_eq((const char *) child->content,
+ (const char *) search->content, pcmk__str_casei)) {
+ return child;
+ }
- } else if (exact) {
+ if (exact) {
+ // We won't find another comment at the same position
return NULL;
}
}
return NULL;
}
/*!
* \internal
* \brief Make one XML comment match another (in content)
*
* \param[in,out] parent If \p target is NULL and this is not, add or update
* comment child of this XML node that matches \p update
* \param[in,out] target If not NULL, update this XML comment node
* \param[in] update Make comment content match this (must not be NULL)
*
* \note At least one of \parent and \target must be non-NULL
*/
void
pcmk__xc_update(xmlNode *parent, xmlNode *target, xmlNode *update)
{
CRM_CHECK(update != NULL, return);
CRM_CHECK(update->type == XML_COMMENT_NODE, return);
if (target == NULL) {
- target = pcmk__xc_match(parent, update, false);
+ target = pcmk__xc_match_child(parent, update, false);
}
if (target == NULL) {
pcmk__xml_copy(parent, update);
} else if (!pcmk__str_eq((const char *)target->content, (const char *)update->content, pcmk__str_casei)) {
xmlFree(target->content);
target->content = xmlStrdup(update->content);
}
}