From 0b40d033943f4a3bfa249501794dffecf60ed968 Mon Sep 17 00:00:00 2001
From: Jouni Malinen <j@w1.fi>
Date: Sun, 8 Nov 2009 14:06:01 +0200
Subject: [PATCH] WPS: Move generic UPnP XML helper functionality into a
 separate file

---
 hostapd/Makefile        |   1 +
 src/wps/http.h          |  28 ++++
 src/wps/upnp_xml.c      | 252 ++++++++++++++++++++++++++++++++++++
 src/wps/upnp_xml.h      |  21 +++
 src/wps/wps_upnp_i.h    |  17 +--
 src/wps/wps_upnp_web.c  | 275 +++-------------------------------------
 wpa_supplicant/Makefile |   1 +
 7 files changed, 323 insertions(+), 272 deletions(-)
 create mode 100644 src/wps/http.h
 create mode 100644 src/wps/upnp_xml.c
 create mode 100644 src/wps/upnp_xml.h

diff --git a/hostapd/Makefile b/hostapd/Makefile
index 2933d0dd6..6756c8fd4 100644
--- a/hostapd/Makefile
+++ b/hostapd/Makefile
@@ -309,6 +309,7 @@ OBJS += ../src/wps/wps_upnp.o
 OBJS += ../src/wps/wps_upnp_ssdp.o
 OBJS += ../src/wps/wps_upnp_web.o
 OBJS += ../src/wps/wps_upnp_event.o
+OBJS += ../src/wps/upnp_xml.o
 OBJS += ../src/wps/httpread.o
 OBJS += ../src/wps/http_client.o
 endif
diff --git a/src/wps/http.h b/src/wps/http.h
new file mode 100644
index 000000000..8bb8ff3d6
--- /dev/null
+++ b/src/wps/http.h
@@ -0,0 +1,28 @@
+/*
+ * HTTP for WPS
+ * Copyright (c) 2000-2003 Intel Corporation
+ * Copyright (c) 2006-2007 Sony Corporation
+ * Copyright (c) 2008-2009 Atheros Communications
+ * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
+ *
+ * See wps_upnp.c for more details on licensing and code history.
+ */
+
+#ifndef HTTP_H
+#define HTTP_H
+
+enum http_reply_code {
+	HTTP_OK = 200,
+	HTTP_BAD_REQUEST = 400,
+	UPNP_INVALID_ACTION = 401,
+	UPNP_INVALID_ARGS = 402,
+	HTTP_PRECONDITION_FAILED = 412,
+	HTTP_INTERNAL_SERVER_ERROR = 500,
+	HTTP_UNIMPLEMENTED = 501,
+	UPNP_ACTION_FAILED = 501,
+	UPNP_ARG_VALUE_INVALID = 600,
+	UPNP_ARG_VALUE_OUT_OF_RANGE = 601,
+	UPNP_OUT_OF_MEMORY = 603
+};
+
+#endif /* HTTP_H */
diff --git a/src/wps/upnp_xml.c b/src/wps/upnp_xml.c
new file mode 100644
index 000000000..b1b1e2b16
--- /dev/null
+++ b/src/wps/upnp_xml.c
@@ -0,0 +1,252 @@
+/*
+ * UPnP XML helper routines
+ * Copyright (c) 2000-2003 Intel Corporation
+ * Copyright (c) 2006-2007 Sony Corporation
+ * Copyright (c) 2008-2009 Atheros Communications
+ * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
+ *
+ * See wps_upnp.c for more details on licensing and code history.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "base64.h"
+#include "http.h"
+#include "upnp_xml.h"
+
+
+/*
+ * XML parsing and formatting
+ *
+ * XML is a markup language based on unicode; usually (and in our case,
+ * always!) based on utf-8. utf-8 uses a variable number of bytes per
+ * character. utf-8 has the advantage that all non-ASCII unicode characters are
+ * represented by sequences of non-ascii (high bit set) bytes, whereas ASCII
+ * characters are single ascii bytes, thus we can use typical text processing.
+ *
+ * (One other interesting thing about utf-8 is that it is possible to look at
+ * any random byte and determine if it is the first byte of a character as
+ * versus a continuation byte).
+ *
+ * The base syntax of XML uses a few ASCII punctionation characters; any
+ * characters that would appear in the payload data are rewritten using
+ * sequences, e.g., &amp; for ampersand(&) and &lt for left angle bracket (<).
+ * Five such escapes total (more can be defined but that does not apply to our
+ * case). Thus we can safely parse for angle brackets etc.
+ *
+ * XML describes tree structures of tagged data, with each element beginning
+ * with an opening tag <label> and ending with a closing tag </label> with
+ * matching label. (There is also a self-closing tag <label/> which is supposed
+ * to be equivalent to <label></label>, i.e., no payload, but we are unlikely
+ * to see it for our purpose).
+ *
+ * Actually the opening tags are a little more complicated because they can
+ * contain "attributes" after the label (delimited by ascii space or tab chars)
+ * of the form attribute_label="value" or attribute_label='value'; as it turns
+ * out we do not have to read any of these attributes, just ignore them.
+ *
+ * Labels are any sequence of chars other than space, tab, right angle bracket
+ * (and ?), but may have an inner structure of <namespace><colon><plain_label>.
+ * As it turns out, we can ignore the namespaces, in fact we can ignore the
+ * entire tree hierarchy, because the plain labels we are looking for will be
+ * unique (not in general, but for this application). We do however have to be
+ * careful to skip over the namespaces.
+ *
+ * In generating XML we have to be more careful, but that is easy because
+ * everything we do is pretty canned. The only real care to take is to escape
+ * any special chars in our payload.
+ */
+
+/**
+ * xml_next_tag - Advance to next tag
+ * @in: Input
+ * @out: OUT: start of tag just after '<'
+ * @out_tagname: OUT: start of name of tag, skipping namespace
+ * @end: OUT: one after tag
+ * Returns: 0 on success, 1 on failure
+ *
+ * A tag has form:
+ *     <left angle bracket><...><right angle bracket>
+ * Within the angle brackets, there is an optional leading forward slash (which
+ * makes the tag an ending tag), then an optional leading label (followed by
+ * colon) and then the tag name itself.
+ *
+ * Note that angle brackets present in the original data must have been encoded
+ * as &lt; and &gt; so they will not trouble us.
+ */
+static int xml_next_tag(const char *in, const char **out,
+			const char **out_tagname, const char **end)
+{
+	while (*in && *in != '<')
+		in++;
+	if (*in != '<')
+		return 1;
+	*out = ++in;
+	if (*in == '/')
+		in++;
+	*out_tagname = in; /* maybe */
+	while (isalnum(*in) || *in == '-')
+		in++;
+	if (*in == ':')
+		*out_tagname = ++in;
+	while (*in && *in != '>')
+		in++;
+	if (*in != '>')
+		return 1;
+	*end = ++in;
+	return 0;
+}
+
+
+/* xml_data_encode -- format data for xml file, escaping special characters.
+ *
+ * Note that we assume we are using utf8 both as input and as output!
+ * In utf8, characters may be classed as follows:
+ *     0xxxxxxx(2) -- 1 byte ascii char
+ *     11xxxxxx(2) -- 1st byte of multi-byte char w/ unicode value >= 0x80
+ *         110xxxxx(2) -- 1st byte of 2 byte sequence (5 payload bits here)
+ *         1110xxxx(2) -- 1st byte of 3 byte sequence (4 payload bits here)
+ *         11110xxx(2) -- 1st byte of 4 byte sequence (3 payload bits here)
+ *      10xxxxxx(2) -- extension byte (6 payload bits per byte)
+ *      Some values implied by the above are however illegal because they
+ *      do not represent unicode chars or are not the shortest encoding.
+ * Actually, we can almost entirely ignore the above and just do
+ * text processing same as for ascii text.
+ *
+ * XML is written with arbitrary unicode characters, except that five
+ * characters have special meaning and so must be escaped where they
+ * appear in payload data... which we do here.
+ */
+void xml_data_encode(struct wpabuf *buf, const char *data, int len)
+{
+	int i;
+	for (i = 0; i < len; i++) {
+		u8 c = ((u8 *) data)[i];
+		if (c == '<') {
+			wpabuf_put_str(buf, "&lt;");
+			continue;
+		}
+		if (c == '>') {
+			wpabuf_put_str(buf, "&gt;");
+			continue;
+		}
+		if (c == '&') {
+			wpabuf_put_str(buf, "&amp;");
+			continue;
+		}
+		if (c == '\'') {
+			wpabuf_put_str(buf, "&apos;");
+			continue;
+		}
+		if (c == '"') {
+			wpabuf_put_str(buf, "&quot;");
+			continue;
+		}
+		/*
+		 * We could try to represent control characters using the
+		 * sequence: &#x; where x is replaced by a hex numeral, but not
+		 * clear why we would do this.
+		 */
+		wpabuf_put_u8(buf, c);
+	}
+}
+
+
+/* xml_add_tagged_data -- format tagged data as a new xml line.
+ *
+ * tag must not have any special chars.
+ * data may have special chars, which are escaped.
+ */
+void xml_add_tagged_data(struct wpabuf *buf, const char *tag, const char *data)
+{
+	wpabuf_printf(buf, "<%s>", tag);
+	xml_data_encode(buf, data, os_strlen(data));
+	wpabuf_printf(buf, "</%s>\n", tag);
+}
+
+
+/* A POST body looks something like (per upnp spec):
+ * <?xml version="1.0"?>
+ * <s:Envelope
+ *     xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"
+ *     s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
+ *   <s:Body>
+ *     <u:actionName xmlns:u="urn:schemas-upnp-org:service:serviceType:v">
+ *       <argumentName>in arg value</argumentName>
+ *       other in args and their values go here, if any
+ *     </u:actionName>
+ *   </s:Body>
+ * </s:Envelope>
+ *
+ * where :
+ *      s: might be some other namespace name followed by colon
+ *      u: might be some other namespace name followed by colon
+ *      actionName will be replaced according to action requested
+ *      schema following actionName will be WFA scheme instead
+ *      argumentName will be actual argument name
+ *      (in arg value) will be actual argument value
+ */
+char * xml_get_first_item(const char *doc, const char *item)
+{
+	const char *match = item;
+	int match_len = os_strlen(item);
+	const char *tag, *tagname, *end;
+	char *value;
+
+	/*
+	 * This is crude: ignore any possible tag name conflicts and go right
+	 * to the first tag of this name. This should be ok for the limited
+	 * domain of UPnP messages.
+	 */
+	for (;;) {
+		if (xml_next_tag(doc, &tag, &tagname, &end))
+			return NULL;
+		doc = end;
+		if (!os_strncasecmp(tagname, match, match_len) &&
+		    *tag != '/' &&
+		    (tagname[match_len] == '>' ||
+		     !isgraph(tagname[match_len]))) {
+			break;
+		}
+	}
+	end = doc;
+	while (*end && *end != '<')
+		end++;
+	value = os_zalloc(1 + (end - doc));
+	if (value == NULL)
+		return NULL;
+	os_memcpy(value, doc, end - doc);
+	return value;
+}
+
+
+struct wpabuf * xml_get_base64_item(const char *data, const char *name,
+				    enum http_reply_code *ret)
+{
+	char *msg;
+	struct wpabuf *buf;
+	unsigned char *decoded;
+	size_t len;
+
+	msg = xml_get_first_item(data, name);
+	if (msg == NULL) {
+		*ret = UPNP_ARG_VALUE_INVALID;
+		return NULL;
+	}
+
+	decoded = base64_decode((unsigned char *) msg, os_strlen(msg), &len);
+	os_free(msg);
+	if (decoded == NULL) {
+		*ret = UPNP_OUT_OF_MEMORY;
+		return NULL;
+	}
+
+	buf = wpabuf_alloc_ext_data(decoded, len);
+	if (buf == NULL) {
+		os_free(decoded);
+		*ret = UPNP_OUT_OF_MEMORY;
+		return NULL;
+	}
+	return buf;
+}
diff --git a/src/wps/upnp_xml.h b/src/wps/upnp_xml.h
new file mode 100644
index 000000000..eb683fd31
--- /dev/null
+++ b/src/wps/upnp_xml.h
@@ -0,0 +1,21 @@
+/*
+ * UPnP XML helper routines
+ * Copyright (c) 2000-2003 Intel Corporation
+ * Copyright (c) 2006-2007 Sony Corporation
+ * Copyright (c) 2008-2009 Atheros Communications
+ * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
+ *
+ * See wps_upnp.c for more details on licensing and code history.
+ */
+
+#ifndef UPNP_XML_H
+#define UPNP_XML_H
+
+void xml_data_encode(struct wpabuf *buf, const char *data, int len);
+void xml_add_tagged_data(struct wpabuf *buf, const char *tag,
+			 const char *data);
+char * xml_get_first_item(const char *doc, const char *item);
+struct wpabuf * xml_get_base64_item(const char *data, const char *name,
+				    enum http_reply_code *ret);
+
+#endif /* UPNP_XML_H */
diff --git a/src/wps/wps_upnp_i.h b/src/wps/wps_upnp_i.h
index 1d72aafa8..00b71d702 100644
--- a/src/wps/wps_upnp_i.h
+++ b/src/wps/wps_upnp_i.h
@@ -11,6 +11,8 @@
 #ifndef WPS_UPNP_I_H
 #define WPS_UPNP_I_H
 
+#include "http.h"
+
 #define UPNP_MULTICAST_ADDRESS  "239.255.255.250" /* for UPnP multicasting */
 #define UPNP_MULTICAST_PORT 1900 /* UDP port to monitor for UPnP */
 
@@ -33,21 +35,6 @@ struct subscription;
 struct upnp_wps_device_sm;
 
 
-enum http_reply_code {
-	HTTP_OK = 200,
-	HTTP_BAD_REQUEST = 400,
-	UPNP_INVALID_ACTION = 401,
-	UPNP_INVALID_ARGS = 402,
-	HTTP_PRECONDITION_FAILED = 412,
-	HTTP_INTERNAL_SERVER_ERROR = 500,
-	HTTP_UNIMPLEMENTED = 501,
-	UPNP_ACTION_FAILED = 501,
-	UPNP_ARG_VALUE_INVALID = 600,
-	UPNP_ARG_VALUE_OUT_OF_RANGE = 601,
-	UPNP_OUT_OF_MEMORY = 603
-};
-
-
 enum advertisement_type_enum {
 	ADVERTISE_UP = 0,
 	ADVERTISE_DOWN = 1,
diff --git a/src/wps/wps_upnp_web.c b/src/wps/wps_upnp_web.c
index db47c29ea..2ff3af269 100644
--- a/src/wps/wps_upnp_web.c
+++ b/src/wps/wps_upnp_web.c
@@ -19,6 +19,7 @@
 #include "wps_i.h"
 #include "wps_upnp.h"
 #include "wps_upnp_i.h"
+#include "upnp_xml.h"
 
 /***************************************************************************
  * Web connections (we serve pages of info about ourselves, handle
@@ -59,216 +60,6 @@ struct web_connection {
 };
 
 
-/*
- * XML parsing and formatting
- *
- * XML is a markup language based on unicode; usually (and in our case,
- * always!) based on utf-8. utf-8 uses a variable number of bytes per
- * character. utf-8 has the advantage that all non-ASCII unicode characters are
- * represented by sequences of non-ascii (high bit set) bytes, whereas ASCII
- * characters are single ascii bytes, thus we can use typical text processing.
- *
- * (One other interesting thing about utf-8 is that it is possible to look at
- * any random byte and determine if it is the first byte of a character as
- * versus a continuation byte).
- *
- * The base syntax of XML uses a few ASCII punctionation characters; any
- * characters that would appear in the payload data are rewritten using
- * sequences, e.g., &amp; for ampersand(&) and &lt for left angle bracket (<).
- * Five such escapes total (more can be defined but that does not apply to our
- * case). Thus we can safely parse for angle brackets etc.
- *
- * XML describes tree structures of tagged data, with each element beginning
- * with an opening tag <label> and ending with a closing tag </label> with
- * matching label. (There is also a self-closing tag <label/> which is supposed
- * to be equivalent to <label></label>, i.e., no payload, but we are unlikely
- * to see it for our purpose).
- *
- * Actually the opening tags are a little more complicated because they can
- * contain "attributes" after the label (delimited by ascii space or tab chars)
- * of the form attribute_label="value" or attribute_label='value'; as it turns
- * out we do not have to read any of these attributes, just ignore them.
- *
- * Labels are any sequence of chars other than space, tab, right angle bracket
- * (and ?), but may have an inner structure of <namespace><colon><plain_label>.
- * As it turns out, we can ignore the namespaces, in fact we can ignore the
- * entire tree hierarchy, because the plain labels we are looking for will be
- * unique (not in general, but for this application). We do however have to be
- * careful to skip over the namespaces.
- *
- * In generating XML we have to be more careful, but that is easy because
- * everything we do is pretty canned. The only real care to take is to escape
- * any special chars in our payload.
- */
-
-/**
- * xml_next_tag - Advance to next tag
- * @in: Input
- * @out: OUT: start of tag just after '<'
- * @out_tagname: OUT: start of name of tag, skipping namespace
- * @end: OUT: one after tag
- * Returns: 0 on success, 1 on failure
- *
- * A tag has form:
- *     <left angle bracket><...><right angle bracket>
- * Within the angle brackets, there is an optional leading forward slash (which
- * makes the tag an ending tag), then an optional leading label (followed by
- * colon) and then the tag name itself.
- *
- * Note that angle brackets present in the original data must have been encoded
- * as &lt; and &gt; so they will not trouble us.
- */
-static int xml_next_tag(char *in, char **out, char **out_tagname,
-			char **end)
-{
-	while (*in && *in != '<')
-		in++;
-	if (*in != '<')
-		return 1;
-	*out = ++in;
-	if (*in == '/')
-		in++;
-	*out_tagname = in; /* maybe */
-	while (isalnum(*in) || *in == '-')
-		in++;
-	if (*in == ':')
-		*out_tagname = ++in;
-	while (*in && *in != '>')
-		in++;
-	if (*in != '>')
-		return 1;
-	*end = ++in;
-	return 0;
-}
-
-
-/* xml_data_encode -- format data for xml file, escaping special characters.
- *
- * Note that we assume we are using utf8 both as input and as output!
- * In utf8, characters may be classed as follows:
- *     0xxxxxxx(2) -- 1 byte ascii char
- *     11xxxxxx(2) -- 1st byte of multi-byte char w/ unicode value >= 0x80
- *         110xxxxx(2) -- 1st byte of 2 byte sequence (5 payload bits here)
- *         1110xxxx(2) -- 1st byte of 3 byte sequence (4 payload bits here)
- *         11110xxx(2) -- 1st byte of 4 byte sequence (3 payload bits here)
- *      10xxxxxx(2) -- extension byte (6 payload bits per byte)
- *      Some values implied by the above are however illegal because they
- *      do not represent unicode chars or are not the shortest encoding.
- * Actually, we can almost entirely ignore the above and just do
- * text processing same as for ascii text.
- *
- * XML is written with arbitrary unicode characters, except that five
- * characters have special meaning and so must be escaped where they
- * appear in payload data... which we do here.
- */
-static void xml_data_encode(struct wpabuf *buf, const char *data, int len)
-{
-	int i;
-	for (i = 0; i < len; i++) {
-		u8 c = ((u8 *) data)[i];
-		if (c == '<') {
-			wpabuf_put_str(buf, "&lt;");
-			continue;
-		}
-		if (c == '>') {
-			wpabuf_put_str(buf, "&gt;");
-			continue;
-		}
-		if (c == '&') {
-			wpabuf_put_str(buf, "&amp;");
-			continue;
-		}
-		if (c == '\'') {
-			wpabuf_put_str(buf, "&apos;");
-			continue;
-		}
-		if (c == '"') {
-			wpabuf_put_str(buf, "&quot;");
-			continue;
-		}
-		/*
-		 * We could try to represent control characters using the
-		 * sequence: &#x; where x is replaced by a hex numeral, but not
-		 * clear why we would do this.
-		 */
-		wpabuf_put_u8(buf, c);
-	}
-}
-
-
-/* xml_add_tagged_data -- format tagged data as a new xml line.
- *
- * tag must not have any special chars.
- * data may have special chars, which are escaped.
- */
-static void xml_add_tagged_data(struct wpabuf *buf, const char *tag,
-				const char *data)
-{
-	wpabuf_printf(buf, "<%s>", tag);
-	xml_data_encode(buf, data, os_strlen(data));
-	wpabuf_printf(buf, "</%s>\n", tag);
-}
-
-
-/* A POST body looks something like (per upnp spec):
- * <?xml version="1.0"?>
- * <s:Envelope
- *     xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"
- *     s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
- *   <s:Body>
- *     <u:actionName xmlns:u="urn:schemas-upnp-org:service:serviceType:v">
- *       <argumentName>in arg value</argumentName>
- *       other in args and their values go here, if any
- *     </u:actionName>
- *   </s:Body>
- * </s:Envelope>
- *
- * where :
- *      s: might be some other namespace name followed by colon
- *      u: might be some other namespace name followed by colon
- *      actionName will be replaced according to action requested
- *      schema following actionName will be WFA scheme instead
- *      argumentName will be actual argument name
- *      (in arg value) will be actual argument value
- */
-static int
-upnp_get_first_document_item(char *doc, const char *item, char **value)
-{
-	const char *match = item;
-	int match_len = os_strlen(item);
-	char *tag;
-	char *tagname;
-	char *end;
-
-	*value = NULL;          /* default, bad */
-
-	/*
-	 * This is crude: ignore any possible tag name conflicts and go right
-	 * to the first tag of this name. This should be ok for the limited
-	 * domain of UPnP messages.
-	 */
-	for (;;) {
-		if (xml_next_tag(doc, &tag, &tagname, &end))
-			return 1;
-		doc = end;
-		if (!os_strncasecmp(tagname, match, match_len) &&
-		    *tag != '/' &&
-		    (tagname[match_len] == '>' ||
-		     !isgraph(tagname[match_len]))) {
-			break;
-		}
-	}
-	end = doc;
-	while (*end && *end != '<')
-		end++;
-	*value = os_zalloc(1 + (end - doc));
-	if (*value == NULL)
-		return 1;
-	os_memcpy(*value, doc, end - doc);
-	return 0;
-}
-
-
 /*
  * "Files" that we serve via HTTP. The format of these files is given by
  * WFA WPS specifications. Extra white space has been removed to save space.
@@ -770,36 +561,6 @@ send_buf:
 }
 
 
-static struct wpabuf * web_get_item(char *data, const char *name,
-				    enum http_reply_code *ret)
-{
-	char *msg;
-	struct wpabuf *buf;
-	unsigned char *decoded;
-	size_t len;
-
-	if (upnp_get_first_document_item(data, name, &msg)) {
-		*ret = UPNP_ARG_VALUE_INVALID;
-		return NULL;
-	}
-
-	decoded = base64_decode((unsigned char *) msg, os_strlen(msg), &len);
-	os_free(msg);
-	if (decoded == NULL) {
-		*ret = UPNP_OUT_OF_MEMORY;
-		return NULL;
-	}
-
-	buf = wpabuf_alloc_ext_data(decoded, len);
-	if (buf == NULL) {
-		os_free(decoded);
-		*ret = UPNP_OUT_OF_MEMORY;
-		return NULL;
-	}
-	return buf;
-}
-
-
 static enum http_reply_code
 web_process_get_device_info(struct upnp_wps_device_sm *sm,
 			    struct wpabuf **reply, const char **replyname)
@@ -835,7 +596,7 @@ web_process_put_message(struct upnp_wps_device_sm *sm, char *data,
 	wpa_printf(MSG_DEBUG, "WPS UPnP: PutMessage");
 	if (sm->ctx->rx_req_put_message == NULL)
 		return HTTP_INTERNAL_SERVER_ERROR;
-	msg = web_get_item(data, "NewInMessage", &ret);
+	msg = xml_get_base64_item(data, "NewInMessage", &ret);
 	if (msg == NULL)
 		return ret;
 	*reply = sm->ctx->rx_req_put_message(sm->priv, &sm->peer, msg);
@@ -858,7 +619,7 @@ web_process_get_ap_settings(struct upnp_wps_device_sm *sm, char *data,
 	wpa_printf(MSG_DEBUG, "WPS UPnP: GetAPSettings");
 	if (sm->ctx->rx_req_get_ap_settings == NULL)
 		return HTTP_INTERNAL_SERVER_ERROR;
-	msg = web_get_item(data, "NewMessage", &ret);
+	msg = xml_get_base64_item(data, "NewMessage", &ret);
 	if (msg == NULL)
 		return ret;
 	*reply = sm->ctx->rx_req_get_ap_settings(sm->priv, msg);
@@ -878,7 +639,7 @@ web_process_set_ap_settings(struct upnp_wps_device_sm *sm, char *data,
 	enum http_reply_code ret;
 
 	wpa_printf(MSG_DEBUG, "WPS UPnP: SetAPSettings");
-	msg = web_get_item(data, "NewAPSettings", &ret);
+	msg = xml_get_base64_item(data, "NewAPSettings", &ret);
 	if (msg == NULL)
 		return ret;
 	if (!sm->ctx->rx_req_set_ap_settings ||
@@ -901,7 +662,7 @@ web_process_del_ap_settings(struct upnp_wps_device_sm *sm, char *data,
 	enum http_reply_code ret;
 
 	wpa_printf(MSG_DEBUG, "WPS UPnP: DelAPSettings");
-	msg = web_get_item(data, "NewAPSettings", &ret);
+	msg = xml_get_base64_item(data, "NewAPSettings", &ret);
 	if (msg == NULL)
 		return ret;
 	if (!sm->ctx->rx_req_del_ap_settings ||
@@ -927,7 +688,7 @@ web_process_get_sta_settings(struct upnp_wps_device_sm *sm, char *data,
 	wpa_printf(MSG_DEBUG, "WPS UPnP: GetSTASettings");
 	if (sm->ctx->rx_req_get_sta_settings == NULL)
 		return HTTP_INTERNAL_SERVER_ERROR;
-	msg = web_get_item(data, "NewMessage", &ret);
+	msg = xml_get_base64_item(data, "NewMessage", &ret);
 	if (msg == NULL)
 		return ret;
 	*reply = sm->ctx->rx_req_get_sta_settings(sm->priv, msg);
@@ -947,7 +708,7 @@ web_process_set_sta_settings(struct upnp_wps_device_sm *sm, char *data,
 	enum http_reply_code ret;
 
 	wpa_printf(MSG_DEBUG, "WPS UPnP: SetSTASettings");
-	msg = web_get_item(data, "NewSTASettings", &ret);
+	msg = xml_get_base64_item(data, "NewSTASettings", &ret);
 	if (msg == NULL)
 		return ret;
 	if (!sm->ctx->rx_req_set_sta_settings ||
@@ -970,7 +731,7 @@ web_process_del_sta_settings(struct upnp_wps_device_sm *sm, char *data,
 	enum http_reply_code ret;
 
 	wpa_printf(MSG_DEBUG, "WPS UPnP: DelSTASettings");
-	msg = web_get_item(data, "NewSTASettings", &ret);
+	msg = xml_get_base64_item(data, "NewSTASettings", &ret);
 	if (msg == NULL)
 		return ret;
 	if (!sm->ctx->rx_req_del_sta_settings ||
@@ -1002,18 +763,18 @@ web_process_put_wlan_response(struct upnp_wps_device_sm *sm, char *data,
 	 */
 
 	wpa_printf(MSG_DEBUG, "WPS UPnP: PutWLANResponse");
-	msg = web_get_item(data, "NewMessage", &ret);
+	msg = xml_get_base64_item(data, "NewMessage", &ret);
 	if (msg == NULL)
 		return ret;
-	if (upnp_get_first_document_item(data, "NewWLANEventType", &val)) {
+	val = xml_get_first_item(data, "NewWLANEventType");
+	if (val == NULL) {
 		wpabuf_free(msg);
 		return UPNP_ARG_VALUE_INVALID;
 	}
 	ev_type = atol(val);
 	os_free(val);
-	val = NULL;
-	if (upnp_get_first_document_item(data, "NewWLANEventMAC", &val) ||
-	    hwaddr_aton(val, macaddr)) {
+	val = xml_get_first_item(data, "NewWLANEventMAC");
+	if (val == NULL || hwaddr_aton(val, macaddr)) {
 		wpabuf_free(msg);
 		os_free(val);
 		return UPNP_ARG_VALUE_INVALID;
@@ -1053,7 +814,7 @@ web_process_set_selected_registrar(struct upnp_wps_device_sm *sm, char *data,
 	enum http_reply_code ret;
 
 	wpa_printf(MSG_DEBUG, "WPS UPnP: SetSelectedRegistrar");
-	msg = web_get_item(data, "NewMessage", &ret);
+	msg = xml_get_base64_item(data, "NewMessage", &ret);
 	if (msg == NULL)
 		return ret;
 	if (!sm->ctx->rx_req_set_selected_registrar ||
@@ -1076,7 +837,7 @@ web_process_reboot_ap(struct upnp_wps_device_sm *sm, char *data,
 	enum http_reply_code ret;
 
 	wpa_printf(MSG_DEBUG, "WPS UPnP: RebootAP");
-	msg = web_get_item(data, "NewAPSettings", &ret);
+	msg = xml_get_base64_item(data, "NewAPSettings", &ret);
 	if (msg == NULL)
 		return ret;
 	if (!sm->ctx->rx_req_reboot_ap ||
@@ -1099,7 +860,7 @@ web_process_reset_ap(struct upnp_wps_device_sm *sm, char *data,
 	enum http_reply_code ret;
 
 	wpa_printf(MSG_DEBUG, "WPS UPnP: ResetAP");
-	msg = web_get_item(data, "NewMessage", &ret);
+	msg = xml_get_base64_item(data, "NewMessage", &ret);
 	if (msg == NULL)
 		return ret;
 	if (!sm->ctx->rx_req_reset_ap ||
@@ -1122,7 +883,7 @@ web_process_reboot_sta(struct upnp_wps_device_sm *sm, char *data,
 	enum http_reply_code ret;
 
 	wpa_printf(MSG_DEBUG, "WPS UPnP: RebootSTA");
-	msg = web_get_item(data, "NewSTASettings", &ret);
+	msg = xml_get_base64_item(data, "NewSTASettings", &ret);
 	if (msg == NULL)
 		return ret;
 	if (!sm->ctx->rx_req_reboot_sta ||
@@ -1145,7 +906,7 @@ web_process_reset_sta(struct upnp_wps_device_sm *sm, char *data,
 	enum http_reply_code ret;
 
 	wpa_printf(MSG_DEBUG, "WPS UPnP: ResetSTA");
-	msg = web_get_item(data, "NewMessage", &ret);
+	msg = xml_get_base64_item(data, "NewMessage", &ret);
 	if (msg == NULL)
 		return ret;
 	if (!sm->ctx->rx_req_reset_sta ||
diff --git a/wpa_supplicant/Makefile b/wpa_supplicant/Makefile
index 13936822f..70e7a3a6b 100644
--- a/wpa_supplicant/Makefile
+++ b/wpa_supplicant/Makefile
@@ -509,6 +509,7 @@ OBJS += ../src/wps/wps_upnp.o
 OBJS += ../src/wps/wps_upnp_ssdp.o
 OBJS += ../src/wps/wps_upnp_web.o
 OBJS += ../src/wps/wps_upnp_event.o
+OBJS += ../src/wps/upnp_xml.o
 OBJS += ../src/wps/httpread.o
 OBJS += ../src/wps/http_client.o
 endif