[PATCH 02/10] Add buf_append_xmlescaped() and use it to build GP XML config

[Daniel Lenski]

(This also fixes a small bug in d2cbc42c, where David Woodhouse forgot to
change the name of the xmlNode variable for the <portal-name> tag in one
place)

Signed-off-by: Daniel Lenski <dlenski at gmail.com>
---
 auth-globalprotect.c   | 19 ++++++++++---------
 http.c                 | 13 +++++++++++++
 openconnect-internal.h |  1 +
 3 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/auth-globalprotect.c b/auth-globalprotect.c
index 0c151fe..d3799d6 100644
--- a/auth-globalprotect.c
+++ b/auth-globalprotect.c
@@ -198,7 +198,7 @@ static int parse_portal_xml(struct openconnect_info *vpninfo, xmlNode *xml_node)
 	if (xmlnode_is_named(xml_node, "policy")) {
 		for (x = xml_node->children, xml_node = NULL; x; x = x->next) {
 			if (xmlnode_is_named(x, "portal-name"))
-				portal = (char *)xmlNodeGetContent(xml_node);
+				portal = (char *)xmlNodeGetContent(x);
 			else if (xmlnode_is_named(x, "gateways"))
 				xml_node = x;
 		}
@@ -221,11 +221,9 @@ gateways:
 		buf = buf_alloc();
 		buf_append(buf, "<GPPortal>\n  <ServerList>\n");
 		if (portal) {
-			/* XXX: What if the name in 'portal' has characters which need to be
-			 * escaped in XML?  Either build up a tree using libxml "properly"
-			 * so it does it for us, or at the very least we need a
-			 * buf_append_xmlescaped(), don't we? */
-			buf_append(buf, "      <HostEntry><HostName>%s</HostName><HostAddress>%s", portal, vpninfo->hostname);
+			buf_append(buf, "      <HostEntry><HostName>");
+			buf_append_xmlescaped(buf, portal);
+			buf_append(buf, "</HostName><HostAddress>%s", vpninfo->hostname);
 			if (vpninfo->port!=443)
 				buf_append(buf, ":%d", vpninfo->port);
 			buf_append(buf, "/global-protect</HostAddress></HostEntry>\n");
@@ -256,10 +254,13 @@ gateways:
 
 			xmlnode_get_prop(xml_node, "name", &choice->name);
 			for (x = xml_node->children; x; x=x->next)
-				if (xmlnode_is_named(x, "description"))
-					buf_append(buf, "      <HostEntry><HostName>%s</HostName><HostAddress>%s/ssl-vpn</HostAddress></HostEntry>\n",
-					           choice->label = (char *)xmlNodeGetContent(x),
+				if (xmlnode_is_named(x, "description")) {
+					choice->label = (char *)xmlNodeGetContent(x);
+					buf_append(buf, "      <HostEntry><HostName>");
+					buf_append_xmlescaped(buf, choice->label);
+					buf_append(buf, "</HostName><HostAddress>%s/ssl-vpn</HostAddress></HostEntry>\n",
 					           choice->name);
+				}
 
 			opt->choices[opt->nr_choices++] = choice;
 			vpn_progress(vpninfo, PRG_INFO, _("  %s (%s)\n"),
diff --git a/http.c b/http.c
index 5307d82..a860ae4 100644
--- a/http.c
+++ b/http.c
@@ -54,6 +54,19 @@ void buf_append_urlencoded(struct oc_text_buf *buf, const char *str)
 	}
 }
 
+void buf_append_xmlescaped(struct oc_text_buf *buf, const char *str)
+{
+	while (str && *str) {
+		unsigned char c = *str;
+		if (c=='<' || c=='>' || c=='&' || c=='"' || c=='\'')
+			buf_append(buf, "&#x%02x;", c);
+		else
+			buf_append_bytes(buf, str, 1);
+
+		str++;
+	}
+}
+
 void buf_append_hex(struct oc_text_buf *buf, const void *str, unsigned len)
 {
 	const unsigned char *data = str;
diff --git a/openconnect-internal.h b/openconnect-internal.h
index e0a9218..4b65444 100644
--- a/openconnect-internal.h
+++ b/openconnect-internal.h
@@ -1037,6 +1037,7 @@ int get_utf8char(const char **utf8);
 void buf_append_from_utf16le(struct oc_text_buf *buf, const void *utf16);
 void buf_truncate(struct oc_text_buf *buf);
 void buf_append_urlencoded(struct oc_text_buf *buf, const char *str);
+void buf_append_xmlescaped(struct oc_text_buf *buf, const char *str);
 int buf_error(struct oc_text_buf *buf);
 int buf_free(struct oc_text_buf *buf);
 char *openconnect_create_useragent(const char *base);
-- 
2.7.4