libpurple/tests/test_xmlnode.c

#include <string.h>

#include "tests.h"
#include "../xmlnode.h"

/*
 * If we really wanted to test the billion laughs attack we would
 * need to have more than just 4 ha's.  But as long as this shorter
 * document fails to parse, the longer one should also fail to parse.
 */
START_TEST(test_xmlnode_billion_laughs_attack)
{
	const char *malicious_xml_doc = "<!DOCTYPE root [ <!ENTITY ha \"Ha !\"><!ENTITY ha2 \"&ha; &ha;\"><!ENTITY ha3 \"&ha2; &ha2;\"> ]><root>&ha3;</root>";

	/* Uncomment this line if you want to see the error message given by
	   the parser for the above XML document */
	/* purple_debug_set_enabled(TRUE); */

	fail_if(xmlnode_from_str(malicious_xml_doc, -1),
			"xmlnode_from_str() returned an XML tree, but we didn't want it to");
}
END_TEST

#define check_doc_structure(x) { \
	xmlnode *ping, *child1, *child2; \
	fail_if(x == NULL, "Failed to parse document"); \
	ping = xmlnode_get_child(x, "ping"); \
	fail_if(ping == NULL, "Failed to find 'ping' child"); \
	child1 = xmlnode_get_child(ping, "child1"); \
	fail_if(child1 == NULL, "Failed to find 'child1'"); \
	child2 = xmlnode_get_child(child1, "child2"); \
	fail_if(child2 == NULL, "Failed to find 'child2'"); \
	xmlnode_new_child(child2, "a"); \
	\
	assert_string_equal("jabber:client", xmlnode_get_namespace(x)); \
	/* NOTE: xmlnode_get_namespace() returns the namespace of the element, not the
	 * current default namespace.  See http://www.w3.org/TR/xml-names/#defaulting and
	 * http://www.w3.org/TR/xml-names/#dt-defaultNS.
	 */ \
	assert_string_equal("urn:xmpp:ping", xmlnode_get_namespace(ping)); \
	assert_string_equal("jabber:client", xmlnode_get_namespace(child1)); \
	assert_string_equal("urn:xmpp:ping", xmlnode_get_namespace(child2)); \
	/*
	 * This fails (well, actually crashes [the ns is NULL]) unless
	 * xmlnode_new_child() actually sets the element namespace.
	assert_string_equal("jabber:client", xmlnode_get_namespace(xmlnode_get_child(child2, "a")));
	 */ \
	\
	assert_string_equal("jabber:client", xmlnode_get_default_namespace(x)); \
	assert_string_equal("jabber:client", xmlnode_get_default_namespace(ping)); \
	assert_string_equal("jabber:client", xmlnode_get_default_namespace(child1)); \
	assert_string_equal("jabber:client", xmlnode_get_default_namespace(child2)); \
}

START_TEST(test_xmlnode_prefixes)
{
	const char *xml_doc =
		"<iq type='get' xmlns='jabber:client' xmlns:ping='urn:xmpp:ping'>"
			"<ping:ping>"
				"<child1>"
					"<ping:child2></ping:child2>" /* xmlns='jabber:child' */
				"</child1>"
			"</ping:ping>"
		"</iq>";
	char *str;
	xmlnode *xml, *reparsed;

	xml = xmlnode_from_str(xml_doc, -1);
	check_doc_structure(xml);

	/* Check that xmlnode_from_str(xmlnode_to_str(xml, NULL), -1) is idempotent. */
	str = xmlnode_to_str(xml, NULL);
	fail_if(str == NULL, "Failed to serialize XMLnode");
	reparsed = xmlnode_from_str(str, -1);
	fail_if(reparsed == NULL, "Failed to reparse xml document");
	check_doc_structure(reparsed);

	g_free(str);
	xmlnode_free(xml);
	xmlnode_free(reparsed);
}
END_TEST


START_TEST(test_strip_prefixes)
{
	const char *xml_doc = "<message xmlns='jabber:client' from='user@gmail.com/resource' to='another_user@darkrain42.org' type='chat' id='purple'>"
		"<cha:active xmlns:cha='http://jabber.org/protocol/chatstates'/>"
		"<body>xvlc xvlc</body>"
		"<im:html xmlns:im='http://jabber.org/protocol/xhtml-im'>"
			"<xht:body xmlns:xht='http://www.w3.org/1999/xhtml'>"
				"<xht:p>xvlc <xht:span style='font-weight: bold;'>xvlc</xht:span></xht:p>"
			"</xht:body>"
		"</im:html>"
	"</message>";
	const char *out = "<message xmlns='jabber:client' from='user@gmail.com/resource' to='another_user@darkrain42.org' type='chat' id='purple'>"
		"<active xmlns:cha='http://jabber.org/protocol/chatstates' xmlns='http://jabber.org/protocol/chatstates'/>"
		"<body>xvlc xvlc</body>"
		"<html xmlns:im='http://jabber.org/protocol/xhtml-im' xmlns='http://jabber.org/protocol/xhtml-im'>"
			"<body xmlns:xht='http://www.w3.org/1999/xhtml' xmlns='http://www.w3.org/1999/xhtml'>"
				"<p>xvlc <span style='font-weight: bold;'>xvlc</span></p>"
			"</body>"
		"</html>"
	"</message>";
	char *str;
	xmlnode *xml;

	xml = xmlnode_from_str(xml_doc, -1);
	fail_if(xml == NULL, "Failed to parse XML");

	xmlnode_strip_prefixes(xml);
	str = xmlnode_to_str(xml, NULL);
	assert_string_equal_free(out, str);

	xmlnode_free(xml);
}
END_TEST

Suite *
xmlnode_suite(void)
{
	Suite *s = suite_create("Utility Functions");

	TCase *tc = tcase_create("xmlnode");
	tcase_add_test(tc, test_xmlnode_billion_laughs_attack);
	tcase_add_test(tc, test_xmlnode_prefixes);
	tcase_add_test(tc, test_strip_prefixes);

	suite_add_tcase(s, tc);

	return s;
}