xml.c
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xml.c
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	/*
	* Copyright (C) 2004 Andrew Beekhof <andrew@beekhof.net>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU 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 software 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
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public
	* License along with this library; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include <crm_internal.h>
	#include <sys/param.h>
	#include <stdio.h>
	#include <sys/types.h>
	#include <unistd.h>
	#include <time.h>
	#include <string.h>

	#include <stdlib.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <ctype.h>

	#include <clplumbing/ipc.h>
	#include <clplumbing/cl_log.h>

	#include <crm/crm.h>
	#include <crm/msg_xml.h>
	#include <crm/common/xml.h>

	#include <clplumbing/md5.h>
	#if HAVE_BZLIB_H
	# include <bzlib.h>
	#endif

	#define XML_BUFFER_SIZE 4096
	#define XML_PARSER_DEBUG 0

	xmlDoc getDocPtr(xmlNode node);

	struct schema_s
	{
	int type;
	const char *name;
	const char *location;
	const char *transform;
	int after_transform;
	};

	struct schema_s known_schemas[] = {
	/* 0 */ { 0, "none", NULL, NULL, 1 },
	/* 1 */ { 1, "pacemaker-0.6", DTD_DIRECTORY"/crm.dtd", DTD_DIRECTORY"/upgrade06.xsl", 4 },
	/* 2 */ { 1, "transitional-0.6", DTD_DIRECTORY"/crm-transitional.dtd", DTD_DIRECTORY"/upgrade06.xsl", 4 },
	/* 3 */ { 2, "pacemaker-0.7", DTD_DIRECTORY"/pacemaker-1.0.rng", NULL, 0 },
	/* 4 */ { 2, "pacemaker-1.0", DTD_DIRECTORY"/pacemaker-1.0.rng", NULL, 0 },
	};

	static const char *filter[] = {
	XML_ATTR_ORIGIN,
	XML_DIFF_MARKER,
	XML_CIB_ATTR_WRITTEN,
	};

	static void add_ha_nocopy(HA_Message parent, HA_Message child, const char *field)
	{
	int next = parent->nfields;
	if (parent->nfields >= parent->nalloc && ha_msg_expand(parent) != HA_OK ) {
	crm_err("Parent expansion failed");
	return;
	}

	parent->names[next] = crm_strdup(field);
	parent->nlens[next] = strlen(field);
	parent->values[next] = child;
	parent->vlens[next] = sizeof(HA_Message);
	parent->types[next] = FT_UNCOMPRESS;
	parent->nfields++;
	}

	int print_spaces(char *buffer, int spaces, int max);

	int log_data_element(const char function, const char prefix, int log_level,
	int depth, xmlNode *data, gboolean formatted);

	int get_tag_name(const char *input, size_t offset, size_t max);
	int get_attr_name(const char *input, size_t offset, size_t max);
	int get_attr_value(const char *input, size_t offset, size_t max);
	gboolean can_prune_leaf(xmlNode *xml_node);

	void diff_filter_context(int context, int upper_bound, int lower_bound,
	xmlNode xml_node, xmlNode parent);
	int in_upper_context(int depth, int context, xmlNode *xml_node);

	xmlNode *
	find_xml_node(xmlNode root, const char search_path, gboolean must_find)
	{
	const char *name = "NULL";
	if(must_find \|\| root != NULL) {
	crm_validate_data(root);
	}
	if(root != NULL) {
	name = crm_element_name(root);
	}

	if(search_path == NULL) {
	crm_warn("Will never find <NULL>");
	return NULL;
	}

	xml_child_iter_filter(
	root, a_child, search_path,
	/* crm_debug_5("returning node (%s).", crm_element_name(a_child)); */
	crm_validate_data(a_child);
	return a_child;
	);

	if(must_find) {
	crm_warn("Could not find %s in %s.", search_path, name);
	} else if(root != NULL) {
	crm_debug_3("Could not find %s in %s.", search_path, name);
	} else {
	crm_debug_3("Could not find %s in <NULL>.", search_path);
	}


	return NULL;
	}

	xmlNode*
	find_entity(xmlNode parent, const char node_name, const char *id)
	{
	crm_validate_data(parent);
	xml_child_iter_filter(
	parent, a_child, node_name,
	if(id == NULL \|\| crm_str_eq(id, ID(a_child), TRUE)) {
	crm_debug_4("returning node (%s).",
	crm_element_name(a_child));
	return a_child;
	}
	);
	crm_debug_3("node <%s id=%s> not found in %s.",
	node_name, id, crm_element_name(parent));
	return NULL;
	}

	void
	copy_in_properties(xmlNode* target, xmlNode *src)
	{
	crm_validate_data(src);
	crm_validate_data(target);

	if(src == NULL) {
	crm_warn("No node to copy properties from");

	} else if (target == NULL) {
	crm_err("No node to copy properties into");

	} else {
	xml_prop_iter(
	src, local_prop_name, local_prop_value,
	expand_plus_plus(target, local_prop_name, local_prop_value)
	);
	crm_validate_data(target);
	}

	return;
	}

	void fix_plus_plus_recursive(xmlNode* target)
	{
	xml_prop_iter(target, name, value, expand_plus_plus(target, name, value));
	xml_child_iter(target, child, fix_plus_plus_recursive(child));
	}


	void
	expand_plus_plus(xmlNode* target, const char name, const char value)
	{
	int offset = 1;
	int name_len = 0;
	int int_value = 0;
	int value_len = 0;

	const char *old_value = NULL;

	if(value == NULL \|\| name == NULL) {
	return;
	}

	old_value = crm_element_value(target, name);

	if(old_value == NULL) {
	/* if no previous value, set unexpanded */
	goto set_unexpanded;

	} else if(strstr(value, name) != value) {
	goto set_unexpanded;
	}

	name_len = strlen(name);
	value_len = strlen(value);
	if(value_len < (name_len + 2)
	\|\| value[name_len] != '+'
	\|\| (value[name_len+1] != '+' && value[name_len+1] != '=')) {
	goto set_unexpanded;
	}

	/* if we are expanding ourselves,
	* then no previous value was set and leave int_value as 0
	*/
	if(old_value != value) {
	int_value = char2score(old_value);
	}

	if(value[name_len+1] != '+') {
	const char *offset_s = value+(name_len+2);
	offset = char2score(offset_s);
	}
	int_value += offset;

	if(int_value > INFINITY) {
	int_value = INFINITY;
	}

	crm_xml_add_int(target, name, int_value);
	return;

	set_unexpanded:
	if(old_value == value) {
	/* the old value is already set, nothing to do */
	return;
	}
	crm_xml_add(target, name, value);
	return;
	}

	xmlDoc getDocPtr(xmlNode node)
	{
	xmlDoc *doc = NULL;
	CRM_CHECK(node != NULL, return NULL);

	doc = node->doc;
	if(doc == NULL) {
	doc = xmlNewDoc((const xmlChar*)"1.0");
	xmlDocSetRootElement(doc, node);
	xmlSetTreeDoc(node, doc);
	}
	return doc;
	}

	xmlNode*
	add_node_copy(xmlNode parent, xmlNode src_node)
	{
	xmlNode *child = NULL;
	xmlDoc *doc = getDocPtr(parent);
	CRM_CHECK(src_node != NULL, return NULL);

	child = xmlDocCopyNode(src_node, doc, 1);
	xmlAddChild(parent, child);
	return child;
	}


	int
	add_node_nocopy(xmlNode parent, const char name, xmlNode *child)
	{
	add_node_copy(parent, child);
	free_xml(child);
	return HA_OK;
	}

	const char *
	crm_xml_add(xmlNode* node, const char name, const char value)
	{
	xmlAttr *attr = NULL;
	CRM_CHECK(node != NULL, return NULL);
	CRM_CHECK(name != NULL, return NULL);

	if(value == NULL) {
	return NULL;
	}

	#if XML_PARANOIA_CHECKS
	{
	const char *old_value = NULL;
	old_value = crm_element_value(node, name);

	/* Could be re-setting the same value */
	CRM_CHECK_AND_STORE(old_value != value,
	crm_err("Cannot reset %s with crm_xml_add(%s)",
	name, value);
	return value);
	}
	#endif

	attr = xmlSetProp(node, (const xmlChar)name, (const xmlChar)value);
	CRM_CHECK(attr && attr->children && attr->children->content, return NULL);
	return (char *)attr->children->content;
	}

	const char *
	crm_xml_replace(xmlNode* node, const char name, const char value)
	{
	xmlAttr *attr = NULL;
	const char *old_value = NULL;
	CRM_CHECK(node != NULL, return NULL);
	CRM_CHECK(name != NULL && name[0] != 0, return NULL);

	old_value = crm_element_value(node, name);

	/* Could be re-setting the same value */
	CRM_CHECK_AND_STORE(old_value != value, return value);

	if (old_value != NULL && value == NULL) {
	xml_remove_prop(node, name);
	return NULL;

	} else if(value == NULL) {
	return NULL;
	}

	attr = xmlSetProp(node, (const xmlChar)name, (const xmlChar)value);
	CRM_CHECK(attr && attr->children && attr->children->content, return NULL);
	return (char *)attr->children->content;
	}

	const char *
	crm_xml_add_int(xmlNode* node, const char *name, int value)
	{
	char *number = crm_itoa(value);
	const char *added = crm_xml_add(node, name, number);
	crm_free(number);
	return added;
	}

	xmlNode*
	create_xml_node(xmlNode parent, const char name)
	{
	xmlDoc *doc = NULL;
	xmlNode *node = NULL;

	if (name == NULL \|\| name[0] == 0) {
	return NULL;
	}

	if(parent == NULL) {
	doc = xmlNewDoc((const xmlChar*)"1.0");
	node = xmlNewDocRawNode(doc, NULL, (const xmlChar*)name, NULL);
	xmlDocSetRootElement(doc, node);

	} else {
	doc = getDocPtr(parent);
	node = xmlNewDocRawNode(doc, NULL, (const xmlChar*)name, NULL);
	xmlAddChild(parent, node);
	}
	return node;
	}

	void
	free_xml_from_parent(xmlNode parent, xmlNode a_node)
	{
	CRM_CHECK(a_node != NULL, return);

	xmlUnlinkNode(a_node);
	xmlFreeNode(a_node);
	}

	xmlNode*
	copy_xml(xmlNode *src)
	{
	xmlDoc doc = xmlNewDoc((const xmlChar)"1.0");
	xmlNode *copy = xmlDocCopyNode(src, doc, 1);
	xmlDocSetRootElement(doc, copy);
	xmlSetTreeDoc(copy, doc);
	return copy;
	}


	static void crm_xml_err(void * ctx, const char * msg, ...) G_GNUC_PRINTF(2,3);
	extern size_t strlcat(char * dest, const char *source, size_t len);

	static void crm_xml_err(void * ctx, const char * msg, ...)
	{
	int len = 0;
	va_list args;
	char *buf = NULL;
	static int buffer_len = 0;
	static char *buffer = NULL;

	va_start(args, msg);
	len = vasprintf(&buf, msg, args);

	if(strchr(buf, '\n')) {
	buf[len - 1] = 0;
	if(buffer) {
	crm_err("XML Error: %s%s", buffer, buf);
	free(buffer);
	} else {
	crm_err("XML Error: %s", buf);
	}
	buffer = NULL;
	buffer_len = 0;

	} else if(buffer == NULL) {
	buffer_len = len;
	buffer = buf;
	buf = NULL;

	} else {
	buffer_len += len;
	buffer = realloc(buffer, buffer_len);
	strlcat(buffer, buf, buffer_len);
	}

	va_end(args);
	if(buf) {
	free(buf);
	}
	}

	xmlNode*
	string2xml(const char *input)
	{
	xmlNode *xml = NULL;
	xmlDocPtr output = NULL;
	xmlParserCtxtPtr ctxt = NULL;
	xmlErrorPtr last_error = NULL;

	if(input == NULL) {
	crm_err("Can't parse NULL input");
	return NULL;
	}

	/* create a parser context */
	ctxt = xmlNewParserCtxt();
	CRM_CHECK(ctxt != NULL, return NULL);

	/* xmlCtxtUseOptions(ctxt, XML_PARSE_NOBLANKS\|XML_PARSE_RECOVER); */

	xmlCtxtResetLastError(ctxt);
	xmlSetGenericErrorFunc(ctxt, crm_xml_err);
	/* initGenericErrorDefaultFunc(crm_xml_err); */
	output = xmlCtxtReadDoc(ctxt, (const xmlChar*)input, NULL, NULL, XML_PARSE_NOBLANKS\|XML_PARSE_RECOVER);
	if(output) {
	xml = xmlDocGetRootElement(output);
	}
	last_error = xmlCtxtGetLastError(ctxt);
	if(last_error && last_error->code != XML_ERR_OK) {
	/* crm_abort(__FILE__,__PRETTY_FUNCTION__,__LINE__, "last_error->code != XML_ERR_OK", TRUE, TRUE); */
	/*
	* http://xmlsoft.org/html/libxml-xmlerror.html#xmlErrorLevel
	* http://xmlsoft.org/html/libxml-xmlerror.html#xmlParserErrors
	*/
	crm_warn("Parsing failed (domain=%d, level=%d, code=%d): %s",
	last_error->domain, last_error->level,
	last_error->code, last_error->message);

	if(last_error->code != XML_ERR_DOCUMENT_END) {
	crm_err("Couldn't%s parse %d chars: %s", xml?" fully":"", (int)strlen(input), input);
	if(xml != NULL) {
	crm_log_xml_err(xml, "Partial");
	}
	}
	}

	xmlFreeParserCtxt(ctxt);
	return xml;
	}

	xmlNode *
	stdin2xml(void)
	{
	size_t data_length = 0;
	size_t read_chars = 0;

	char *xml_buffer = NULL;
	xmlNode *xml_obj = NULL;

	do {
	crm_realloc(xml_buffer, XML_BUFFER_SIZE + data_length + 1);
	read_chars = fread(xml_buffer + data_length, 1, XML_BUFFER_SIZE, stdin);
	data_length += read_chars;
	} while (read_chars > 0);

	if(data_length == 0) {
	crm_warn("No XML supplied on stdin");
	return NULL;
	}

	xml_buffer[data_length] = '\0';

	xml_obj = string2xml(xml_buffer);
	crm_free(xml_buffer);

	crm_log_xml_debug_3(xml_obj, "Created fragment");
	return xml_obj;
	}

	static char *
	decompress_file(const char *filename)
	{
	char *buffer = NULL;
	#if HAVE_BZLIB_H
	int rc = 0;
	size_t length = 0, read_len = 0;

	BZFILE *bz_file = NULL;
	FILE *input = fopen(filename, "r");

	if(input == NULL) {
	cl_perror("Could not open %s for reading", filename);
	return NULL;
	}

	bz_file = BZ2_bzReadOpen(&rc, input, 0, 0, NULL, 0);

	if ( rc != BZ_OK ) {
	BZ2_bzReadClose ( &rc, bz_file);
	return NULL;
	}

	rc = BZ_OK;
	while ( rc == BZ_OK ) {
	crm_realloc(buffer, XML_BUFFER_SIZE + length + 1);
	read_len = BZ2_bzRead (
	&rc, bz_file, buffer + length, XML_BUFFER_SIZE);

	crm_debug_5("Read %ld bytes from file: %d",
	(long)read_len, rc);

	if ( rc == BZ_OK \|\| rc == BZ_STREAM_END) {
	length += read_len;
	}
	}

	buffer[length] = '\0';
	read_len = length;

	if ( rc != BZ_STREAM_END ) {
	crm_err("Couldnt read compressed xml from file");
	crm_free(buffer);
	buffer = NULL;
	}

	BZ2_bzReadClose (&rc, bz_file);
	fclose(input);

	#else
	crm_err("Cannot read compressed files:"
	" bzlib was not available at compile time");
	#endif
	return buffer;
	}

	xmlNode *
	filename2xml(const char *filename)
	{
	xmlNode *xml = NULL;
	xmlDocPtr output = NULL;
	xmlParserCtxtPtr ctxt = NULL;
	xmlErrorPtr last_error = NULL;
	static int xml_options = XML_PARSE_NOBLANKS\|XML_PARSE_RECOVER;

	/* create a parser context */
	ctxt = xmlNewParserCtxt();
	CRM_CHECK(ctxt != NULL, return NULL);

	/* xmlCtxtUseOptions(ctxt, XML_PARSE_NOBLANKS\|XML_PARSE_RECOVER); */

	xmlCtxtResetLastError(ctxt);
	xmlSetGenericErrorFunc(ctxt, crm_xml_err);
	/* initGenericErrorDefaultFunc(crm_xml_err); */

	if(filename == NULL) {
	/* STDIN_FILENO == fileno(stdin) */
	output = xmlCtxtReadFd(ctxt, STDIN_FILENO, "unknown.xml", NULL, xml_options);

	} else if(strstr(filename, ".bz2") == NULL) {
	output = xmlCtxtReadFile(ctxt, filename, NULL, xml_options);

	} else {
	char *input = decompress_file(filename);
	output = xmlCtxtReadDoc(ctxt, (const xmlChar*)input, NULL, NULL, xml_options);
	crm_free(input);
	}

	if(output) {
	xml = xmlDocGetRootElement(output);
	}

	last_error = xmlCtxtGetLastError(ctxt);
	if(last_error && last_error->code != XML_ERR_OK) {
	/* crm_abort(__FILE__,__PRETTY_FUNCTION__,__LINE__, "last_error->code != XML_ERR_OK", TRUE, TRUE); */
	/*
	* http://xmlsoft.org/html/libxml-xmlerror.html#xmlErrorLevel
	* http://xmlsoft.org/html/libxml-xmlerror.html#xmlParserErrors
	*/
	crm_err("Parsing failed (domain=%d, level=%d, code=%d): %s",
	last_error->domain, last_error->level,
	last_error->code, last_error->message);

	if(last_error && last_error->code != XML_ERR_OK) {
	crm_err("Couldn't%s parse %s", xml?" fully":"", filename);
	if(xml != NULL) {
	crm_log_xml_err(xml, "Partial");
	}
	}
	}

	xmlFreeParserCtxt(ctxt);
	return xml;
	}

	int
	write_xml_file(xmlNode xml_node, const char filename, gboolean compress)
	{
	int res = 0;
	time_t now;
	char *buffer = NULL;
	char *now_str = NULL;
	unsigned int out = 0;
	FILE *file_output_strm = NULL;
	static mode_t cib_mode = S_IRUSR\|S_IWUSR;

	CRM_CHECK(filename != NULL, return -1);

	crm_debug_3("Writing XML out to %s", filename);
	crm_validate_data(xml_node);
	if (xml_node == NULL) {
	crm_err("Cannot write NULL to %s", filename);
	return -1;
	}

	file_output_strm = fopen(filename, "w");
	if(file_output_strm == NULL) {
	cl_perror("Cannot open %s for writing", filename);
	return -1;
	}

	/* establish the correct permissions */
	fchmod(fileno(file_output_strm), cib_mode);

	crm_log_xml_debug_4(xml_node, "Writing out");

	now = time(NULL);
	now_str = ctime(&now);
	now_str[24] = EOS; /* replace the newline */
	crm_xml_add(xml_node, XML_CIB_ATTR_WRITTEN, now_str);
	crm_validate_data(xml_node);

	buffer = dump_xml_formatted(xml_node);
	CRM_CHECK(buffer != NULL && strlen(buffer) > 0,
	crm_log_xml_warn(xml_node, "dump:failed");
	goto bail);

	if(compress) {
	#if HAVE_BZLIB_H
	int rc = BZ_OK;
	unsigned int in = 0;
	BZFILE *bz_file = NULL;
	bz_file = BZ2_bzWriteOpen(&rc, file_output_strm, 5, 0, 30);
	if(rc != BZ_OK) {
	crm_err("bzWriteOpen failed: %d", rc);
	} else {
	BZ2_bzWrite(&rc,bz_file,buffer,strlen(buffer));
	if(rc != BZ_OK) {
	crm_err("bzWrite() failed: %d", rc);
	}
	}

	if(rc == BZ_OK) {
	BZ2_bzWriteClose(&rc, bz_file, 0, &in, &out);
	if(rc != BZ_OK) {
	crm_err("bzWriteClose() failed: %d",rc);
	out = -1;
	} else {
	crm_debug_2("%s: In: %d, out: %d", filename, in, out);
	}
	}
	#else
	crm_err("Cannot write compressed files:"
	" bzlib was not available at compile time");
	#endif
	}

	if(out <= 0) {
	res = fprintf(file_output_strm, "%s", buffer);
	if(res < 0) {
	cl_perror("Cannot write output to %s", filename);
	goto bail;
	}
	}

	bail:

	if(fflush(file_output_strm) != 0) {
	cl_perror("fflush for %s failed:", filename);
	res = -1;
	}

	if(fsync(fileno(file_output_strm)) < 0) {
	cl_perror("fsync for %s failed:", filename);
	res = -1;
	}

	fclose(file_output_strm);

	crm_debug_3("Saved %d bytes to the Cib as XML", res);
	crm_free(buffer);

	return res;
	}

	void
	print_xml_formatted(int log_level, const char *function,
	xmlNode msg, const char text)
	{
	if(msg == NULL) {
	do_crm_log(log_level, "%s: %s: NULL", function, crm_str(text));
	return;
	}

	crm_validate_data(msg);
	log_data_element(function, text, log_level, 0, msg, TRUE);
	return;
	}

	static HA_Message*
	convert_xml_message_struct(HA_Message parent, xmlNode src_node, const char *field)
	{
	xmlNode *child = NULL;
	xmlNode *__crm_xml_iter = src_node->children;
	xmlAttrPtr prop_iter = src_node->properties;
	const char *name = NULL;
	const char *value = NULL;

	HA_Message *result = ha_msg_new(3);
	ha_msg_add(result, F_XML_TAGNAME, (const char *)src_node->name);

	while(prop_iter != NULL) {
	name = (const char *)prop_iter->name;
	value = (const char *)xmlGetProp(src_node, prop_iter->name);
	prop_iter = prop_iter->next;
	ha_msg_add(result, name, value);
	}

	while(__crm_xml_iter != NULL) {
	child = __crm_xml_iter;
	__crm_xml_iter = __crm_xml_iter->next;
	convert_xml_message_struct(result, child, NULL);
	}

	if(parent == NULL) {
	return result;
	}

	if(field) {
	HA_Message *holder = holder = ha_msg_new(3);
	CRM_ASSERT(holder != NULL);

	ha_msg_add(holder, F_XML_TAGNAME, field);
	add_ha_nocopy(holder, result, (const char*)src_node->name);

	ha_msg_addstruct_compress(parent, field, holder);
	ha_msg_del(holder);

	} else {
	add_ha_nocopy(parent, result, (const char*)src_node->name);
	}
	return result;
	}

	static void
	convert_xml_child(HA_Message msg, xmlNode xml)
	{
	int orig = 0;
	int rc = BZ_OK;
	unsigned int len = 0;

	char *buffer = NULL;
	char *compressed = NULL;
	const char *name = NULL;

	name = (const char *)xml->name;
	buffer = dump_xml_unformatted(xml);
	orig = strlen(buffer);
	if(orig < CRM_BZ2_THRESHOLD) {
	ha_msg_add(msg, name, buffer);
	goto done;
	}

	len = (orig * 1.1) + 600; /* recomended size */

	crm_malloc(compressed, len);
	rc = BZ2_bzBuffToBuffCompress(compressed, &len, buffer, orig, CRM_BZ2_BLOCKS, 0, CRM_BZ2_WORK);

	if(rc != BZ_OK) {
	crm_err("Compression failed: %d", rc);
	crm_free(compressed);
	convert_xml_message_struct(msg, xml, name);
	goto done;
	}

	crm_free(buffer);
	buffer = compressed;
	crm_debug_2("Compression details: %d -> %d", orig, len);
	ha_msg_addbin(msg, name, buffer, len);
	done:
	crm_free(buffer);


	# if 0
	{
	unsigned int used = orig;
	char *uncompressed = NULL;

	crm_debug("Trying to decompress %d bytes", len);
	crm_malloc0(uncompressed, orig);
	rc = BZ2_bzBuffToBuffDecompress(
	uncompressed, &used, compressed, len, 1, 0);
	CRM_CHECK(rc == BZ_OK, ;);
	CRM_CHECK(used == orig, ;);
	crm_debug("rc=%d, used=%d", rc, used);
	if(rc != BZ_OK) {
	exit(100);
	}
	crm_debug("Original %s, decompressed %s", buffer, uncompressed);
	crm_free(uncompressed);
	}
	# endif
	}

	HA_Message*
	convert_xml_message(xmlNode *xml)
	{
	HA_Message *result = NULL;

	result = ha_msg_new(3);
	ha_msg_add(result, F_XML_TAGNAME, (const char *)xml->name);

	xml_prop_iter(xml, name, value, ha_msg_add(result, name, value));
	xml_child_iter(xml, child, convert_xml_child(result, child));

	return result;
	}

	static void
	convert_ha_field(xmlNode parent, HA_Message msg, int lpc)
	{
	int type = 0;
	const char *name = NULL;
	const char *value = NULL;
	xmlNode *xml = NULL;

	int rc = BZ_OK;
	size_t orig_len = 0;
	unsigned int used = 0;
	char *uncompressed = NULL;
	char *compressed = NULL;
	int size = orig_len * 10;

	CRM_CHECK(parent != NULL, return);
	CRM_CHECK(msg != NULL, return);

	name = msg->names[lpc];
	type = cl_get_type(msg, name);

	switch(type) {
	case FT_COMPRESS:
	case FT_STRUCT:
	convert_ha_message(parent, msg->values[lpc], name);
	break;
	case FT_UNCOMPRESS:
	convert_ha_message(parent, cl_get_struct(msg, name), name);
	break;
	case FT_STRING:
	value = cl_get_string(msg, name);
	CRM_CHECK(value != NULL, return);
	crm_debug_5("Converting %s/%d/%s", name, type, value[0] == '<' ? "xml":"field");

	if( value[0] != '<' ) {
	crm_xml_add(parent, name, value);
	break;
	}

	/* unpack xml string */
	xml = string2xml(value);
	if(xml == NULL) {
	crm_err("Conversion of field '%s' failed", name);
	return;
	}

	add_node_nocopy(parent, NULL, xml);
	break;

	case FT_BINARY:
	value = cl_get_binary(msg, name, &orig_len);
	size = orig_len * 10;

	if(orig_len < 3
	\|\| value[0] != 'B'
	\|\| value[1] != 'Z'
	\|\| value[2] != 'h') {
	if(strstr(name, "uuid") == NULL) {
	crm_err("Skipping non-bzip binary field: %s", name);
	}
	return;
	}

	crm_malloc0(compressed, orig_len);
	memcpy(compressed, value, orig_len);

	crm_debug_2("Trying to decompress %d bytes", (int)orig_len);
	retry:
	crm_realloc(uncompressed, size);
	memset(uncompressed, 0, size);
	used = size;

	rc = BZ2_bzBuffToBuffDecompress(
	uncompressed, &used, compressed, orig_len, 1, 0);

	if(rc == BZ_OUTBUFF_FULL) {
	size = size * 2;
	/* dont try to allocate more memory than we have */
	if(size > 0) {
	goto retry;
	}
	}

	if(rc != BZ_OK) {
	crm_err("Decompression of %s (%d bytes) into %d failed: %d",
	name, (int)orig_len, size, rc);

	} else {
	xml = string2xml(uncompressed);
	}

	if(xml != NULL) {
	add_node_copy(parent, xml);
	free_xml(xml);
	}

	crm_free(uncompressed);
	crm_free(compressed);
	break;
	}
	}

	xmlNode *
	convert_ha_message(xmlNode parent, HA_Message msg, const char *field)
	{
	int lpc = 0;
	xmlNode *child = NULL;
	const char *tag = NULL;

	CRM_CHECK(msg != NULL, crm_err("Empty message for %s", field); return parent);

	tag = cl_get_string(msg, F_XML_TAGNAME);
	if(tag == NULL) {
	tag = field;
	}

	if(parent == NULL) {
	parent = create_xml_node(NULL, tag);
	child = parent;

	} else {
	child = create_xml_node(parent, tag);
	}

	for (lpc = 0; lpc < msg->nfields; lpc++) {
	convert_ha_field(child, msg, lpc);
	}

	return parent;
	}

	xmlNode convert_ipc_message(IPC_Message msg, const char *field)
	{
	HA_Message hmsg = wirefmt2msg((char )msg->msg_body, msg->msg_len, 0);
	xmlNode *xml = convert_ha_message(NULL, hmsg, __FUNCTION__);
	crm_msg_del(hmsg);
	return xml;
	}

	xmlNode *
	get_message_xml(xmlNode msg, const char field)
	{
	xmlNode *tmp = first_named_child(msg, field);
	return first_named_child(tmp, NULL);
	}

	gboolean
	add_message_xml(xmlNode msg, const char field, xmlNode *xml)
	{
	xmlNode *holder = create_xml_node(msg, field);
	add_node_copy(holder, xml);
	return TRUE;
	}

	static char *
	dump_xml(xmlNode *an_xml_node, gboolean formatted, gboolean for_digest)
	{
	int len = 0;
	char *buffer = NULL;
	xmlBuffer *xml_buffer = NULL;
	xmlDoc *doc = getDocPtr(an_xml_node);

	/* doc will only be NULL if an_xml_node is */
	CRM_CHECK(doc != NULL, return NULL);

	xml_buffer = xmlBufferCreate();
	CRM_ASSERT(xml_buffer != NULL);

	len = xmlNodeDump(xml_buffer, doc, an_xml_node, 0, formatted);

	if(len > 0) {
	if(for_digest) {
	/* for compatability with the old result which is used for digests */
	len += 3;
	crm_malloc0(buffer, len);
	snprintf(buffer, len, " %s\n", (char *)xml_buffer->content);
	} else {
	buffer = crm_strdup((char *)xml_buffer->content);
	}

	} else {
	crm_err("Conversion failed");
	}

	xmlBufferFree(xml_buffer);
	return buffer;
	}

	char *
	dump_xml_formatted(xmlNode *an_xml_node)
	{
	return dump_xml(an_xml_node, TRUE, FALSE);
	}

	char *
	dump_xml_unformatted(xmlNode *an_xml_node)
	{
	return dump_xml(an_xml_node, FALSE, FALSE);
	}

	#define update_buffer() do { \
	if(printed < 0) { \
	cl_perror("snprintf failed"); \
	goto print; \
	} else if(printed >= (buffer_len - offset)) { \
	crm_err("Output truncated: available=%d, needed=%d", buffer_len - offset, printed); \
	offset += printed; \
	goto print; \
	} else if(offset >= buffer_len) { \
	crm_err("Buffer exceeded"); \
	offset += printed; \
	goto print; \
	} else { \
	offset += printed; \
	} \
	} while(0)

	int
	print_spaces(char *buffer, int depth, int max)
	{
	int lpc = 0;
	int spaces = 2*depth;
	max--;

	/* <= so that we always print 1 space - prevents problems with syslog */
	for(lpc = 0; lpc <= spaces && lpc < max; lpc++) {
	if(sprintf(buffer+lpc, "%c", ' ') < 1) {
	return -1;
	}
	}
	return lpc;
	}

	int
	log_data_element(
	const char function, const char prefix, int log_level, int depth,
	xmlNode *data, gboolean formatted)
	{
	int child_result = 0;

	int offset = 0;
	int printed = 0;
	char *buffer = NULL;
	int buffer_len = 1000;

	const char *name = NULL;
	const char *hidden = NULL;

	if(data == NULL) {
	crm_warn("No data to dump as XML");
	return 0;
	}

	name = crm_element_name(data);
	CRM_ASSERT(name != NULL);

	crm_debug_5("Dumping %s", name);
	crm_malloc0(buffer, buffer_len);

	if(formatted) {
	offset = print_spaces(buffer, depth, buffer_len - offset);
	}

	printed = snprintf(buffer + offset, buffer_len - offset, "<%s", name);
	update_buffer();

	hidden = crm_element_value(data, "hidden");
	xml_prop_iter(
	data, prop_name, prop_value,

	if(prop_name == NULL
	\|\| safe_str_eq(F_XML_TAGNAME, prop_name)) {
	continue;

	} else if(hidden != NULL
	&& prop_name[0] != 0
	&& strstr(hidden, prop_name) != NULL) {
	prop_value = "*****";
	}

	crm_debug_5("Dumping <%s %s=\"%s\"...",
	name, prop_name, prop_value);
	printed = snprintf(buffer + offset, buffer_len - offset,
	" %s=\"%s\"", prop_name, prop_value);
	update_buffer();
	);

	printed = snprintf(buffer + offset, buffer_len - offset,
	" %s>", xml_has_children(data)?"":"/");
	update_buffer();

	print:
	do_crm_log(log_level, "%s: %s%s", function, prefix?prefix:"", buffer);

	if(xml_has_children(data) == FALSE) {
	return 0;
	}

	xml_child_iter(
	data, a_child,
	child_result = log_data_element(
	function, prefix, log_level, depth+1, a_child, formatted);
	);

	if(formatted) {
	offset = print_spaces(buffer, depth, buffer_len);
	}
	do_crm_log(log_level, "%s: %s%s</%s>", function, prefix?prefix:"", buffer, name);

	return 1;
	}

	gboolean
	xml_has_children(const xmlNode *xml_root)
	{
	if(xml_root != NULL && xml_root->children != NULL) {
	return TRUE;
	}
	return FALSE;
	}

	void
	xml_validate(const xmlNode *xml_root)
	{
	CRM_ASSERT(xml_root != NULL);
	}

	int
	crm_element_value_int(xmlNode data, const char name, int *dest)
	{
	const char *value = crm_element_value(data, name);
	CRM_CHECK(dest != NULL, return -1);
	if(value) {
	*dest = crm_int_helper(value, NULL);
	return 0;
	}
	return -1;
	}

	const char *
	crm_element_value_const(const xmlNode data, const char name)
	{
	return crm_element_value(data, name);
	}

	char *
	crm_element_value_copy(xmlNode data, const char name)
	{
	char *value_copy = NULL;
	const char *value = crm_element_value(data, name);
	if(value != NULL) {
	value_copy = crm_strdup(value);
	}
	return value_copy;
	}

	void
	xml_remove_prop(xmlNode obj, const char name)
	{
	xmlUnsetProp(obj, (const xmlChar*)name);
	}

	void
	log_xml_diff(unsigned int log_level, xmlNode diff, const char function)
	{
	xmlNode *added = find_xml_node(diff, "diff-added", FALSE);
	xmlNode *removed = find_xml_node(diff, "diff-removed", FALSE);
	gboolean is_first = TRUE;

	if(crm_log_level < log_level) {
	/* nothing will ever be printed */
	return;
	}

	xml_child_iter(
	removed, child,
	log_data_element(function, "-", log_level, 0, child, TRUE);
	if(is_first) {
	is_first = FALSE;
	} else {
	do_crm_log(log_level, " --- ");
	}

	);
	is_first = TRUE;
	xml_child_iter(
	added, child,
	log_data_element(function, "+", log_level, 0, child, TRUE);
	if(is_first) {
	is_first = FALSE;
	} else {
	do_crm_log(log_level, " +++ ");
	}
	);
	}

	void
	purge_diff_markers(xmlNode *a_node)
	{
	CRM_CHECK(a_node != NULL, return);

	xml_remove_prop(a_node, XML_DIFF_MARKER);
	xml_child_iter(a_node, child,
	purge_diff_markers(child);
	);
	}

	gboolean
	apply_xml_diff(xmlNode old, xmlNode diff, xmlNode **new)
	{
	gboolean result = TRUE;
	const char *digest = crm_element_value(diff, XML_ATTR_DIGEST);
	xmlNode *added = find_xml_node(diff, "diff-added", FALSE);
	xmlNode *removed = find_xml_node(diff, "diff-removed", FALSE);

	int root_nodes_seen = 0;

	CRM_CHECK(new != NULL, return FALSE);

	crm_debug_2("Substraction Phase");
	xml_child_iter(removed, child_diff,
	CRM_CHECK(root_nodes_seen == 0, result = FALSE);
	if(root_nodes_seen == 0) {
	*new = subtract_xml_object(old, child_diff, NULL);
	}
	root_nodes_seen++;
	);
	if(root_nodes_seen == 0) {
	*new = copy_xml(old);

	} else if(root_nodes_seen > 1) {
	crm_err("(-) Diffs cannot contain more than one change set..."
	" saw %d", root_nodes_seen);
	result = FALSE;
	}

	root_nodes_seen = 0;
	crm_debug_2("Addition Phase");
	if(result) {
	xml_child_iter(added, child_diff,
	CRM_CHECK(root_nodes_seen == 0, result = FALSE);
	if(root_nodes_seen == 0) {
	add_xml_object(NULL, *new, child_diff);
	}
	root_nodes_seen++;
	);
	}

	if(root_nodes_seen > 1) {
	crm_err("(+) Diffs cannot contain more than one change set..."
	" saw %d", root_nodes_seen);
	result = FALSE;

	} else if(result && digest) {
	char new_digest = calculate_xml_digest(new, FALSE, TRUE);
	if(safe_str_neq(new_digest, digest)) {
	crm_info("Digest mis-match: expected %s, calculated %s",
	digest, new_digest);
	result = FALSE;
	} else {
	crm_debug_2("Digest matched: expected %s, calculated %s",
	digest, new_digest);
	}

	} else if(result) {
	int lpc = 0;
	xmlNode *intermediate = NULL;
	xmlNode *diff_of_diff = NULL;
	xmlNode *calc_added = NULL;
	xmlNode *calc_removed = NULL;

	const char *value = NULL;
	const char *name = NULL;
	const char *version_attrs[] = {
	XML_ATTR_NUMUPDATES,
	XML_ATTR_GENERATION,
	XML_ATTR_GENERATION_ADMIN
	};

	crm_debug_2("Verification Phase");
	intermediate = diff_xml_object(old, *new, FALSE);
	calc_added = find_xml_node(intermediate, "diff-added", FALSE);
	calc_removed = find_xml_node(intermediate, "diff-removed", FALSE);

	/* add any version details to the diff so they match */
	for(lpc = 0; lpc < DIMOF(version_attrs); lpc++) {
	name = version_attrs[lpc];

	value = crm_element_value(added, name);
	crm_xml_add(calc_added, name, value);

	value = crm_element_value(removed, name);
	crm_xml_add(calc_removed, name, value);
	}

	diff_of_diff = diff_xml_object(intermediate, diff, TRUE);
	if(diff_of_diff != NULL) {
	crm_info("Diff application failed!");
	crm_log_xml_debug(old, "diff:original");
	crm_log_xml_debug(diff, "diff:input");
	result = FALSE;
	}

	free_xml(diff_of_diff);
	free_xml(intermediate);
	diff_of_diff = NULL;
	intermediate = NULL;
	}

	if(result) {
	purge_diff_markers(*new);
	}

	return result;
	}


	xmlNode *
	diff_xml_object(xmlNode old, xmlNode new, gboolean suppress)
	{
	xmlNode *diff = NULL;
	xmlNode *tmp1 = NULL;
	xmlNode *added = NULL;
	xmlNode *removed = NULL;

	tmp1 = subtract_xml_object(old, new, "removed:top");
	if(tmp1 != NULL) {
	if(suppress && can_prune_leaf(tmp1)) {
	free_xml(tmp1);

	} else {
	diff = create_xml_node(NULL, "diff");
	removed = create_xml_node(diff, "diff-removed");
	added = create_xml_node(diff, "diff-added");
	add_node_nocopy(removed, NULL, tmp1);
	}
	}

	tmp1 = subtract_xml_object(new, old, "added:top");
	if(tmp1 != NULL) {
	if(suppress && can_prune_leaf(tmp1)) {
	free_xml(tmp1);
	return diff;

	}

	if(diff == NULL) {
	diff = create_xml_node(NULL, "diff");
	}
	if(removed == NULL) {
	removed = create_xml_node(diff, "diff-removed");
	}
	if(added == NULL) {
	added = create_xml_node(diff, "diff-added");
	}
	add_node_nocopy(added, NULL, tmp1);
	}

	return diff;
	}

	gboolean
	can_prune_leaf(xmlNode *xml_node)
	{
	gboolean can_prune = TRUE;
	/* return FALSE; */

	xml_prop_iter(xml_node, prop_name, prop_value,
	if(safe_str_eq(prop_name, XML_ATTR_ID)) {
	continue;
	}
	can_prune = FALSE;
	);
	xml_child_iter(xml_node, child,
	if(can_prune_leaf(child)) {
	free_xml(child);
	} else {
	can_prune = FALSE;
	}
	);
	return can_prune;
	}


	void
	diff_filter_context(int context, int upper_bound, int lower_bound,
	xmlNode xml_node, xmlNode parent)
	{
	xmlNode *us = NULL;
	xmlNode *new_parent = parent;
	const char *name = crm_element_name(xml_node);

	CRM_CHECK(xml_node != NULL && name != NULL, return);

	us = create_xml_node(parent, name);
	xml_prop_iter(xml_node, prop_name, prop_value,
	lower_bound = context;
	crm_xml_add(us, prop_name, prop_value);
	);
	if(lower_bound >= 0 \|\| upper_bound >= 0) {
	crm_xml_add(us, XML_ATTR_ID, ID(xml_node));
	new_parent = us;

	} else {
	upper_bound = in_upper_context(0, context, xml_node);
	if(upper_bound >= 0) {
	crm_xml_add(us, XML_ATTR_ID, ID(xml_node));
	new_parent = us;
	} else {
	free_xml(us);
	us = NULL;
	}
	}

	xml_child_iter(us, child,
	diff_filter_context(
	context, upper_bound-1, lower_bound-1,
	child, new_parent);
	);
	}

	int
	in_upper_context(int depth, int context, xmlNode *xml_node)
	{
	gboolean has_attributes = FALSE;
	if(context == 0) {
	return 0;
	}

	xml_prop_iter(xml_node, prop_name, prop_value,
	has_attributes = TRUE;
	break;
	);

	if(has_attributes) {
	return depth;

	} else if(depth < context) {
	xml_child_iter(xml_node, child,
	if(in_upper_context(depth+1, context, child)) {
	return depth;
	}
	);
	}
	return 0;
	}


	xmlNode *
	subtract_xml_object(xmlNode left, xmlNode right, const char *marker)
	{
	gboolean skip = FALSE;
	gboolean differences = FALSE;
	xmlNode *diff = NULL;
	xmlNode *child_diff = NULL;
	xmlNode *right_child = NULL;

	const char *id = NULL;
	const char *name = NULL;
	const char *value = NULL;
	const char *right_val = NULL;

	int lpc = 0;
	static int filter_len = DIMOF(filter);

	if(left == NULL) {
	return NULL;
	}

	id = ID(left);
	if(right == NULL) {
	xmlNode *deleted = NULL;

	crm_debug_5("Processing <%s id=%s> (complete copy)",
	crm_element_name(left), id);
	deleted = copy_xml(left);
	crm_xml_add(deleted, XML_DIFF_MARKER, marker);

	return deleted;
	}

	name = crm_element_name(left);
	CRM_CHECK(name != NULL, return NULL);

	diff = create_xml_node(NULL, name);

	/* changes to name/value pairs */
	xml_prop_iter(left, prop_name, left_value,
	if(crm_str_eq(prop_name, XML_ATTR_ID, TRUE)) {
	continue;
	}

	skip = FALSE;
	for(lpc = 0; skip == FALSE && lpc < filter_len; lpc++){
	if(crm_str_eq(prop_name, filter[lpc], TRUE)) {
	skip = TRUE;
	}
	}

	if(skip) { continue; }

	right_val = crm_element_value(right, prop_name);
	if(right_val == NULL) {
	/* new */
	differences = TRUE;
	crm_xml_add(diff, prop_name, left_value);

	} else if(strcmp(left_value, right_val) == 0) {
	/* unchanged */

	} else {
	/* changed */
	differences = TRUE;
	crm_xml_add(diff, prop_name, left_value);
	}
	);

	/* changes to child objects */
	xml_child_iter(
	left, left_child,
	right_child = find_entity(
	right, crm_element_name(left_child), ID(left_child));
	child_diff = subtract_xml_object(
	left_child, right_child, marker);
	if(child_diff != NULL) {
	differences = TRUE;
	add_node_nocopy(diff, NULL, child_diff);
	}

	);

	if(differences == FALSE) {
	/* check for XML_DIFF_MARKER in a child */
	xml_child_iter(
	right, right_child,
	value = crm_element_value(right_child, XML_DIFF_MARKER);
	if(value != NULL && safe_str_eq(value, "removed:top")) {
	crm_debug_3("Found the root of the deletion: %s", name);
	differences = TRUE;
	break;
	}
	);
	}

	if(differences == FALSE) {
	free_xml(diff);
	crm_debug_5("\tNo changes to <%s id=%s>", crm_str(name), id);
	return NULL;
	}
	crm_xml_add(diff, XML_ATTR_ID, id);
	return diff;
	}

	int
	add_xml_object(xmlNode parent, xmlNode target, xmlNode *update)
	{
	const char *object_id = NULL;
	const char *object_name = NULL;

	#if XML_PARSE_DEBUG
	crm_log_xml(LOG_DEBUG_5, "update:", update);
	crm_log_xml(LOG_DEBUG_5, "target:", target);
	#endif

	CRM_CHECK(update != NULL, return 0);

	object_name = crm_element_name(update);
	object_id = ID(update);

	CRM_CHECK(object_name != NULL, return 0);

	if(target == NULL && object_id == NULL) {
	/* placeholder object */
	target = find_xml_node(parent, object_name, FALSE);

	} else if(target == NULL) {
	target = find_entity(parent, object_name, object_id);
	}

	if(target == NULL) {
	target = create_xml_node(parent, object_name);
	CRM_CHECK(target != NULL, return 0);
	#if XML_PARSER_DEBUG
	crm_debug_2("Added <%s%s%s/>", crm_str(object_name),
	object_id?" id=":"", object_id?object_id:"");

	} else {
	crm_debug_3("Found node <%s%s%s/> to update",
	crm_str(object_name),
	object_id?" id=":"", object_id?object_id:"");
	#endif
	}

	copy_in_properties(target, update);

	xml_child_iter(
	update, a_child,
	#if XML_PARSER_DEBUG
	crm_debug_4("Updating child <%s id=%s>",
	crm_element_name(a_child), ID(a_child));
	#endif
	add_xml_object(target, NULL, a_child);
	);

	#if XML_PARSER_DEBUG
	crm_debug_3("Finished with <%s id=%s>",
	crm_str(object_name), crm_str(object_id));
	#endif
	return 0;
	}

	gboolean
	update_xml_child(xmlNode child, xmlNode to_update)
	{
	gboolean can_update = TRUE;

	CRM_CHECK(child != NULL, return FALSE);
	CRM_CHECK(to_update != NULL, return FALSE);

	if(safe_str_neq(crm_element_name(to_update), crm_element_name(child))) {
	can_update = FALSE;

	} else if(safe_str_neq(ID(to_update), ID(child))) {
	can_update = FALSE;

	} else if(can_update) {
	#if XML_PARSER_DEBUG
	crm_log_xml_debug_2(child, "Update match found...");
	#endif
	add_xml_object(NULL, child, to_update);
	}

	xml_child_iter(
	child, child_of_child,
	/* only update the first one */
	if(can_update) {
	break;
	}
	can_update = update_xml_child(child_of_child, to_update);
	);

	return can_update;
	}


	int
	find_xml_children(xmlNode *children, xmlNode root,
	const char tag, const char field, const char *value,
	gboolean search_matches)
	{
	int match_found = 0;

	CRM_CHECK(root != NULL, return FALSE);
	CRM_CHECK(children != NULL, return FALSE);

	if(tag != NULL && safe_str_neq(tag, crm_element_name(root))) {

	} else if(value != NULL
	&& safe_str_neq(value, crm_element_value(root, field))) {

	} else {
	if(*children == NULL) {
	*children = create_xml_node(NULL, __FUNCTION__);
	}
	add_node_copy(*children, root);
	match_found = 1;
	}

	if(search_matches \|\| match_found == 0) {
	xml_child_iter(
	root, child,
	match_found += find_xml_children(
	children, child, tag, field, value,
	search_matches);
	);
	}

	return match_found;
	}

	gboolean
	replace_xml_child(xmlNode parent, xmlNode child, xmlNode *update, gboolean delete_only)
	{
	gboolean can_delete = FALSE;

	const char *up_id = NULL;
	const char *child_id = NULL;
	const char *right_val = NULL;

	CRM_CHECK(child != NULL, return FALSE);
	CRM_CHECK(update != NULL, return FALSE);

	up_id = ID(update);
	child_id = ID(child);

	if(up_id == NULL \|\| safe_str_eq(child_id, up_id)) {
	can_delete = TRUE;
	}
	if(safe_str_neq(crm_element_name(update), crm_element_name(child))) {
	can_delete = FALSE;
	}
	if(can_delete && delete_only) {
	xml_prop_iter(update, prop_name, left_value,
	right_val = crm_element_value(child, prop_name);
	if(safe_str_neq(left_value, right_val)) {
	can_delete = FALSE;
	}
	);
	}

	if(can_delete && parent != NULL) {
	crm_log_xml_debug_4(child, "Delete match found...");
	if(delete_only \|\| update == NULL) {
	free_xml_from_parent(NULL, child);

	} else {
	xmlNode *tmp = copy_xml(update);
	xmlNode *old = xmlReplaceNode(child, tmp);
	free_xml_from_parent(NULL, old);
	}
	child = NULL;
	return TRUE;

	} else if(can_delete) {
	crm_log_xml_debug(child, "Cannot delete the search root");
	can_delete = FALSE;
	}


	xml_child_iter(
	child, child_of_child,
	/* only delete the first one */
	if(can_delete) {
	break;
	}
	can_delete = replace_xml_child(child, child_of_child, update, delete_only);
	);

	return can_delete;
	}

	void
	hash2nvpair(gpointer key, gpointer value, gpointer user_data)
	{
	const char *name = key;
	const char *s_value = value;

	xmlNode *xml_node = user_data;
	xmlNode *xml_child = create_xml_node(xml_node, XML_CIB_TAG_NVPAIR);

	crm_xml_add(xml_child, XML_ATTR_ID, name);
	crm_xml_add(xml_child, XML_NVPAIR_ATTR_NAME, name);
	crm_xml_add(xml_child, XML_NVPAIR_ATTR_VALUE, s_value);

	crm_debug_3("dumped: name=%s value=%s", name, s_value);
	}

	void
	hash2smartfield(gpointer key, gpointer value, gpointer user_data)
	{
	const char *name = key;
	const char *s_value = value;

	xmlNode *xml_node = user_data;

	if(isdigit(name[0])) {
	xmlNode *tmp = create_xml_node(xml_node, XML_TAG_PARAM);
	crm_xml_add(tmp, XML_NVPAIR_ATTR_NAME, name);
	crm_xml_add(tmp, XML_NVPAIR_ATTR_VALUE, s_value);

	} else if(crm_element_value(xml_node, name) == NULL) {
	crm_xml_add(xml_node, name, s_value);
	crm_debug_3("dumped: %s=%s", name, s_value);

	} else {
	crm_debug_2("duplicate: %s=%s", name, s_value);
	}
	}

	void
	hash2field(gpointer key, gpointer value, gpointer user_data)
	{
	const char *name = key;
	const char *s_value = value;

	xmlNode *xml_node = user_data;

	if(crm_element_value(xml_node, name) == NULL) {
	crm_xml_add(xml_node, name, s_value);
	crm_debug_3("dumped: %s=%s", name, s_value);

	} else {
	crm_debug_2("duplicate: %s=%s", name, s_value);
	}
	}

	void
	hash2metafield(gpointer key, gpointer value, gpointer user_data)
	{
	int lpc = 0;
	int max = 0;
	char *crm_name = NULL;

	if(key == NULL \|\| value == NULL) {
	return;
	}

	crm_name = crm_concat(CRM_META, key, '_');

	/* Massage the names so they can be used as shell variables */
	max = strlen(crm_name);
	for(; lpc < max; lpc++) {
	switch(crm_name[lpc]) {
	case '-':
	crm_name[lpc] = '_';
	break;
	}
	}

	hash2field(crm_name, value, user_data);
	crm_free(crm_name);
	}


	GHashTable *
	xml2list(xmlNode *parent)
	{
	xmlNode *nvpair_list = NULL;
	GHashTable *nvpair_hash = g_hash_table_new_full(
	g_str_hash, g_str_equal,
	g_hash_destroy_str, g_hash_destroy_str);

	CRM_CHECK(parent != NULL, return nvpair_hash);

	nvpair_list = find_xml_node(parent, XML_TAG_ATTRS, FALSE);
	if(nvpair_list == NULL) {
	crm_debug_2("No attributes in %s",
	crm_element_name(parent));
	crm_log_xml_debug_2(
	parent,"No attributes for resource op");
	}

	crm_log_xml_debug_3(nvpair_list, "Unpacking");

	xml_prop_iter(
	nvpair_list, key, value,

	crm_debug_4("Added %s=%s", key, value);

	g_hash_table_insert(
	nvpair_hash, crm_strdup(key), crm_strdup(value));
	);

	xml_child_iter_filter(
	nvpair_list, child, XML_TAG_PARAM,

	const char *key = crm_element_value(child, XML_NVPAIR_ATTR_NAME);
	const char *value = crm_element_value(child, XML_NVPAIR_ATTR_VALUE);
	crm_debug_4("Added %s=%s", key, value);
	if(key != NULL && value != NULL) {
	g_hash_table_insert(nvpair_hash, crm_strdup(key), crm_strdup(value));
	}
	);

	return nvpair_hash;
	}


	typedef struct name_value_s
	{
	const char *name;
	const void *value;
	} name_value_t;

	static gint
	sort_pairs(gconstpointer a, gconstpointer b)
	{
	int rc = 0;
	const name_value_t *pair_a = a;
	const name_value_t *pair_b = b;

	CRM_ASSERT(a != NULL);
	CRM_ASSERT(pair_a->name != NULL);

	CRM_ASSERT(b != NULL);
	CRM_ASSERT(pair_b->name != NULL);

	rc = strcmp(pair_a->name, pair_b->name);
	if(rc < 0) {
	return -1;
	} else if(rc > 0) {
	return 1;
	}
	return 0;
	}

	static void
	dump_pair(gpointer data, gpointer user_data)
	{
	name_value_t *pair = data;
	xmlNode *parent = user_data;
	crm_xml_add(parent, pair->name, pair->value);
	}

	xmlNode *
	sorted_xml(xmlNode input, xmlNode parent, gboolean recursive)
	{
	GListPtr sorted = NULL;
	GListPtr unsorted = NULL;
	name_value_t *pair = NULL;
	xmlNode *result = NULL;
	const char *name = crm_element_name(input);

	CRM_CHECK(input != NULL, return NULL);

	name = crm_element_name(input);
	CRM_CHECK(name != NULL, return NULL);

	result = create_xml_node(parent, name);

	xml_prop_iter(input, p_name, p_value,
	crm_malloc0(pair, sizeof(name_value_t));
	pair->name = p_name;
	pair->value = p_value;
	unsorted = g_list_prepend(unsorted, pair);
	pair = NULL;
	);

	sorted = g_list_sort(unsorted, sort_pairs);
	g_list_foreach(sorted, dump_pair, result);
	slist_destroy(name_value_t, child, sorted, crm_free(child));

	if(recursive) {
	xml_child_iter(input, child, sorted_xml(child, result, recursive));
	} else {
	xml_child_iter(input, child, add_node_copy(result, child));
	}

	return result;
	}

	static void
	filter_xml(xmlNode data, const char *filter, int filter_len, gboolean recursive)
	{
	int lpc = 0;

	for(lpc = 0; lpc < filter_len; lpc++) {
	xml_remove_prop(data, filter[lpc]);
	}

	if(recursive == FALSE) {
	return;
	}

	xml_child_iter(data, child, filter_xml(child, filter, filter_len, recursive));
	}

	/* "c048eae664dba840e1d2060f00299e9d" */
	char *
	calculate_xml_digest(xmlNode *input, gboolean sort, gboolean do_filter)
	{
	int i = 0;
	int digest_len = 16;
	char *digest = NULL;
	unsigned char *raw_digest = NULL;
	xmlNode *sorted = NULL;
	char *buffer = NULL;
	size_t buffer_len = 0;

	if(sort \|\| do_filter) {
	sorted = sorted_xml(input, NULL, TRUE);
	} else {
	sorted = copy_xml(input);
	}

	if(do_filter) {
	filter_xml(sorted, filter, DIMOF(filter), TRUE);
	}

	buffer = dump_xml(sorted, FALSE, TRUE);
	buffer_len = strlen(buffer);

	CRM_CHECK(buffer != NULL && buffer_len > 0, free_xml(sorted); return NULL);

	crm_malloc(digest, (2 * digest_len + 1));
	crm_malloc(raw_digest, (digest_len + 1));
	MD5((unsigned char *)buffer, buffer_len, raw_digest);
	for(i = 0; i < digest_len; i++) {
	sprintf(digest+(2*i), "%02x", raw_digest[i]);
	}
	digest[(2*digest_len)] = 0;
	crm_debug_2("Digest %s: %s\n", digest, buffer);
	crm_log_xml(LOG_DEBUG_3, "digest:source", sorted);
	crm_free(buffer);
	crm_free(raw_digest);
	free_xml(sorted);
	return digest;
	}


	#if HAVE_LIBXML2
	# include <libxml/parser.h>
	# include <libxml/tree.h>
	# include <libxml/relaxng.h>
	# include <libxslt/xslt.h>
	# include <libxslt/transform.h>
	#endif

	static gboolean
	validate_with_dtd(
	xmlDocPtr doc, gboolean to_logs, const char *dtd_file)
	{
	gboolean valid = TRUE;

	xmlDtdPtr dtd = NULL;
	xmlValidCtxtPtr cvp = NULL;

	CRM_CHECK(doc != NULL, return FALSE);
	CRM_CHECK(dtd_file != NULL, return FALSE);

	dtd = xmlParseDTD(NULL, (const xmlChar *)dtd_file);
	CRM_CHECK(dtd != NULL, goto cleanup);

	cvp = xmlNewValidCtxt();
	CRM_CHECK(cvp != NULL, goto cleanup);

	if(to_logs) {
	cvp->userData = (void *) LOG_ERR;
	cvp->error = (xmlValidityErrorFunc) cl_log;
	cvp->warning = (xmlValidityWarningFunc) cl_log;
	} else {
	cvp->userData = (void *) stderr;
	cvp->error = (xmlValidityErrorFunc) fprintf;
	cvp->warning = (xmlValidityWarningFunc) fprintf;
	}

	if (!xmlValidateDtd(cvp, doc, dtd)) {
	valid = FALSE;
	}

	cleanup:
	if(cvp) {
	xmlFreeValidCtxt(cvp);
	}
	if(dtd) {
	xmlFreeDtd(dtd);
	}

	return valid;
	}

	xmlNode first_named_child(xmlNode parent, const char *name)
	{
	xml_child_iter_filter(parent, match, name, return match);
	return NULL;
	}

	#if 0
	static void relaxng_invalid_stderr(void * userData, xmlErrorPtr error)
	{
	/*
	Structure xmlError
	struct _xmlError {
	int domain : What part of the library raised this er
	int code : The error code, e.g. an xmlParserError
	char * message : human-readable informative error messag
	xmlErrorLevel level : how consequent is the error
	char * file : the filename
	int line : the line number if available
	char * str1 : extra string information
	char * str2 : extra string information
	char * str3 : extra string information
	int int1 : extra number information
	int int2 : column number of the error or 0 if N/A
	void * ctxt : the parser context if available
	void * node : the node in the tree
	}
	*/
	crm_err("Structured error: line=%d, level=%d %s",
	error->line, error->level, error->message);
	}
	#endif

	static gboolean
	validate_with_relaxng(
	xmlDocPtr doc, gboolean to_logs, const char *relaxng_file)
	{
	gboolean valid = TRUE;
	int rc = 0;

	xmlRelaxNGPtr rng = NULL;
	xmlRelaxNGValidCtxtPtr valid_ctx = NULL;
	xmlRelaxNGParserCtxtPtr parser_ctx = NULL;

	CRM_CHECK(doc != NULL, return FALSE);
	CRM_CHECK(relaxng_file != NULL, return FALSE);

	xmlLoadExtDtdDefaultValue = 1;
	parser_ctx = xmlRelaxNGNewParserCtxt(relaxng_file);
	CRM_CHECK(parser_ctx != NULL, goto cleanup);

	if(to_logs) {
	xmlRelaxNGSetParserErrors(parser_ctx,
	(xmlRelaxNGValidityErrorFunc) cl_log,
	(xmlRelaxNGValidityWarningFunc) cl_log,
	GUINT_TO_POINTER(LOG_ERR));
	} else {
	xmlRelaxNGSetParserErrors(parser_ctx,
	(xmlRelaxNGValidityErrorFunc) fprintf,
	(xmlRelaxNGValidityWarningFunc) fprintf,
	stderr);
	}

	rng = xmlRelaxNGParse(parser_ctx);
	CRM_CHECK(rng != NULL, goto cleanup);

	valid_ctx = xmlRelaxNGNewValidCtxt(rng);
	CRM_CHECK(valid_ctx != NULL, goto cleanup);

	if(to_logs) {
	xmlRelaxNGSetValidErrors(valid_ctx,
	(xmlRelaxNGValidityErrorFunc) cl_log,
	(xmlRelaxNGValidityWarningFunc) cl_log,
	GUINT_TO_POINTER(LOG_ERR));
	} else {
	xmlRelaxNGSetValidErrors(valid_ctx,
	(xmlRelaxNGValidityErrorFunc) fprintf,
	(xmlRelaxNGValidityWarningFunc) fprintf,
	stderr);
	}

	/* xmlRelaxNGSetValidStructuredErrors( */
	/* valid_ctx, relaxng_invalid_stderr, valid_ctx); */

	xmlLineNumbersDefault(1);
	rc = xmlRelaxNGValidateDoc(valid_ctx, doc);
	if (rc > 0) {
	valid = FALSE;

	} else if (rc < 0) {
	crm_err("Internal libxml error during validation\n");
	}

	cleanup:
	if(parser_ctx != NULL) {
	xmlRelaxNGFreeParserCtxt(parser_ctx);
	xmlCleanupParser();
	}

	if(valid_ctx != NULL) {
	xmlRelaxNGFreeValidCtxt(valid_ctx);
	}

	if (rng != NULL) {
	xmlRelaxNGFree(rng);
	}
	return valid;
	}

	static int max_schemas = DIMOF(known_schemas);

	static gboolean validate_with(xmlNode *xml, int method, gboolean to_logs)
	{
	xmlDocPtr doc = NULL;
	gboolean valid = FALSE;
	int type = known_schemas[method].type;
	const char *file = known_schemas[method].location;


	CRM_CHECK(xml != NULL, return FALSE);
	doc = getDocPtr(xml);

	crm_debug_2("Validating with: %s (type=%d)", crm_str(file), type);
	switch(type) {
	case 0:
	valid = TRUE;
	break;
	case 1:
	valid = validate_with_dtd(doc, to_logs, file);
	break;
	case 2:
	valid = validate_with_relaxng(doc, to_logs, file);
	break;
	default:
	crm_err("Unknown validator type: %d", type);
	break;
	}

	return valid;
	}

	gboolean validate_xml(xmlNode xml_blob, const char validation, gboolean to_logs)
	{
	int lpc = 0;

	if(validation == NULL) {
	validation = crm_element_value(xml_blob, XML_ATTR_VALIDATION);
	}

	if(validation == NULL) {
	validation = crm_element_value(xml_blob, "ignore-dtd");
	if(crm_is_true(validation)) {
	validation = "none";
	} else {
	validation = "transitional-0.6";
	}
	}

	if(safe_str_eq(validation, "none")) {
	return TRUE;
	}

	for(; lpc < max_schemas; lpc++) {
	if(safe_str_eq(validation, known_schemas[lpc].name)) {
	return validate_with(xml_blob, lpc, to_logs);
	}
	}

	crm_err("Unknown validator: %s", validation);
	return FALSE;
	}

	static xmlNode apply_transformation(xmlNode xml, const char *transform)
	{
	xmlNode *out = NULL;
	xmlDocPtr res = NULL;
	xmlDocPtr doc = NULL;
	xsltStylesheet *xslt = NULL;

	CRM_CHECK(xml != NULL, return FALSE);
	doc = getDocPtr(xml);

	xmlLoadExtDtdDefaultValue = 1;
	xmlSubstituteEntitiesDefault(1);

	xslt = xsltParseStylesheetFile((const xmlChar *)transform);
	CRM_CHECK(xslt != NULL, goto cleanup);

	res = xsltApplyStylesheet(xslt, doc, NULL);
	CRM_CHECK(res != NULL, goto cleanup);

	out = xmlDocGetRootElement(res);

	cleanup:
	if(xslt) {
	xsltFreeStylesheet(xslt);
	}

	xsltCleanupGlobals();
	xmlCleanupParser();

	return out;
	}

	const char *get_schema_name(int version)
	{
	if(version < 0 \|\| version >= max_schemas) {
	return "unknown";
	}
	return known_schemas[version].name;
	}


	int get_schema_version(const char *name)
	{
	int lpc = 0;
	for(; lpc < max_schemas; lpc++) {
	if(safe_str_eq(name, known_schemas[lpc].name)) {
	return lpc;
	}
	}
	return -1;
	}

	/* set which validation to use */
	#include <crm/cib.h>
	int update_validation(
	xmlNode *xml_blob, int best, gboolean transform, gboolean to_logs)
	{
	xmlNode *xml = NULL;
	char *value = NULL;
	int lpc = 0, match = -1, rc = cib_ok;

	CRM_CHECK(best != NULL, return cib_invalid_argument);
	CRM_CHECK(xml_blob != NULL, return cib_invalid_argument);
	CRM_CHECK(*xml_blob != NULL, return cib_invalid_argument);

	*best = 0;
	xml = *xml_blob;
	value = crm_element_value_copy(xml, XML_ATTR_VALIDATION);

	if(value != NULL) {
	match = get_schema_version(value);
	lpc = match;
	if(transform == FALSE) {
	lpc++;
	}
	}

	if(match == (max_schemas - 1)) {
	/* nothing to do */
	crm_free(value);
	*best = match;
	return cib_ok;
	}

	for(; lpc < max_schemas; lpc++) {
	gboolean valid = TRUE;
	crm_debug("Testing '%s' validation", known_schemas[lpc].name);
	valid = validate_with(xml, lpc, to_logs);

	if(valid) {
	*best = lpc;
	}

	if(valid && transform && known_schemas[lpc].transform != NULL) {
	xmlNode *upgrade = NULL;
	int next = known_schemas[lpc].after_transform;
	if(next <= 0) {
	next = lpc+1;
	}

	crm_notice("Upgrading %s-style configuration to %s with %s",
	known_schemas[lpc].name, known_schemas[lpc+1].name, known_schemas[lpc].transform);
	upgrade = apply_transformation(xml, known_schemas[lpc].transform);
	if(upgrade == NULL) {
	crm_err("Transformation %s failed", known_schemas[lpc].transform);
	rc = cib_transform_failed;

	} else if(validate_with(upgrade, next, to_logs)) {
	crm_info("Transformation %s successful", known_schemas[lpc].transform);
	lpc = next; *best = next;
	free_xml(xml);
	xml = upgrade;
	rc = cib_ok;

	} else {
	crm_err("Transformation %s did not produce a valid configuration", known_schemas[lpc].transform);
	crm_log_xml_info(upgrade, "transform:bad");
	free_xml(upgrade);
	rc = cib_dtd_validation;
	}
	}
	}

	if(*best > match) {
	crm_notice("Upgraded from %s to %s validation", value?value:"<none>", known_schemas[*best].name);
	crm_xml_add(xml, XML_ATTR_VALIDATION, known_schemas[*best].name);
	}

	*xml_blob = xml;
	crm_free(value);
	return rc;
	}

	/* the caller needs to check if the result contains a xmlDocPtr or xmlNodePtr */
	xmlXPathObjectPtr
	xpath_search(xmlNode xml_top, const char path)
	{
	xmlDocPtr doc = NULL;
	xmlXPathObjectPtr xpathObj = NULL;
	xmlXPathContextPtr xpathCtx = NULL;
	const xmlChar xpathExpr = (const xmlChar )path;

	CRM_CHECK(path != NULL, return NULL);
	CRM_CHECK(xml_top != NULL, return NULL);
	CRM_CHECK(strlen(path) > 0, return NULL);

	doc = getDocPtr(xml_top);

	crm_debug_2("Evaluating: %s", path);
	xpathCtx = xmlXPathNewContext(doc);
	CRM_ASSERT(xpathCtx != NULL);

	xpathObj = xmlXPathEvalExpression(xpathExpr, xpathCtx);
	xmlXPathFreeContext(xpathCtx);
	return xpathObj;
	}

	gboolean
	cli_config_update(xmlNode *xml, int best_version)
	{
	gboolean rc = TRUE;
	const char value = crm_element_value(xml, XML_ATTR_VALIDATION);
	if(safe_str_neq(value, LATEST_SCHEMA_VERSION)) {
	int schema_version = 0;
	int min_version = get_schema_version(MINIMUM_SCHEMA_VERSION);

	xmlNode *converted = NULL;

	converted = copy_xml(*xml);
	update_validation(&converted, &schema_version, TRUE, FALSE);

	if(best_version) {
	*best_version = schema_version;
	}

	value = crm_element_value(converted, XML_ATTR_VALIDATION);
	if(schema_version < min_version) {
	fprintf(stderr, "Your current configuration could only be upgraded to %s... "
	"the minimum requirement is %s.\n", crm_str(value), MINIMUM_SCHEMA_VERSION);

	free_xml(converted);
	converted = NULL;
	rc = FALSE;

	} else {
	free_xml(*xml);
	*xml = converted;
	}
	}
	return rc;
	}

	xmlNode expand_idref(xmlNode input)
	{
	const char *tag = NULL;
	const char *ref = NULL;
	xmlNode *result = input;

	if(result == NULL) {
	return NULL;
	}

	tag = crm_element_name(result);
	ref = crm_element_value(result, XML_ATTR_IDREF);

	if(ref != NULL) {
	char *xpath_string = NULL;
	int xpath_max = 512, offset = 0;
	crm_malloc0(xpath_string, xpath_max);

	offset += snprintf(xpath_string + offset, xpath_max - offset, "//%s[@id='%s']", tag, ref);
	result = get_xpath_object(xpath_string, input, LOG_ERR);

	crm_free(xpath_string);
	}
	return result;
	}

	xmlNode*
	get_xpath_object_relative(const char xpath, xmlNode xml_obj, int error_level)
	{
	int len = 0;
	xmlNode *result = NULL;
	char *xpath_full = NULL;
	const char *xpath_prefix = NULL;

	if(xml_obj == NULL \|\| xpath == NULL) {
	return NULL;
	}

	xpath_prefix = (const char *)xmlGetNodePath(xml_obj);
	len += strlen(xpath_prefix);
	len += strlen(xpath);

	xpath_full = crm_strdup(xpath_prefix);
	crm_realloc(xpath_full, len+1);
	strncat(xpath_full, xpath, len);

	result = get_xpath_object(xpath_full, xml_obj, error_level);

	crm_free(xpath_full);
	return result;
	}

	xmlNode*
	get_xpath_object(const char xpath, xmlNode xml_obj, int error_level)
	{
	xmlNode *result = NULL;
	xmlXPathObjectPtr xpathObj = NULL;

	if(xpath == NULL) {
	return xml_obj; /* or return NULL? */
	}

	xpathObj = xpath_search(xml_obj, xpath);
	if(xpathObj == NULL \|\| xpathObj->nodesetval == NULL \|\| xpathObj->nodesetval->nodeNr < 1) {
	do_crm_log(error_level, "No match for %s", xpath);

	} else if(xpathObj->nodesetval->nodeNr > 1) {
	int lpc = 0, max = xpathObj->nodesetval->nodeNr;
	do_crm_log(error_level, "Too many matches for %s", xpath);

	for(lpc = 0; lpc < max; lpc++) {
	xmlNode *match = xpathObj->nodesetval->nodeTab[lpc];
	CRM_CHECK(match != NULL, continue);

	if(match->type == XML_DOCUMENT_NODE) {
	/* Will happen if section = '/' */
	match = match->children;
	}
	do_crm_log(error_level, "%s[%d] = %s", xpath, lpc, xmlGetNodePath(match));
	}
	crm_log_xml(error_level, "Bad Input", xml_obj);

	} else {
	xmlNode *match = xpathObj->nodesetval->nodeTab[0];
	CRM_CHECK(match != NULL, continue);

	if(match->type == XML_DOCUMENT_NODE) {
	/* Will happen if section = '/' */
	match = match->children;
	}
	result = match;
	CRM_CHECK(result->type == XML_ELEMENT_NODE, result = NULL);
	}

	if(xpathObj) {
	xmlXPathFreeObject(xpathObj);
	}
	return result;
	}

	const char *
	crm_element_value(xmlNode data, const char name)
	{
	xmlAttr *attr = NULL;

	if(data == NULL) {
	crm_err("Couldn't find %s in NULL", name?name:"<null>");
	return NULL;

	} else if(name == NULL) {
	crm_err("Couldn't find NULL in %s", crm_element_name(data));
	return NULL;
	}

	attr = xmlHasProp(data, (const xmlChar*)name);
	if(attr == NULL \|\| attr->children == NULL) {
	return NULL;
	}
	return (const char*)attr->children->content;
	}

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