library: Add openconnect_set_xmlpost() to support different CSD modes

In certain configurations, XML POST mode can impact the use of
CSD/Hostscan.  Some gateways are set up to refuse the CSD results if
XML POST is not being used; but in other cases supporting XML POST
on the client side can require a custom CSD wrapper script which isn't
needed for the non-XML-POST case.  So we'll allow the caller to decide
which mode to use.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>

libopenconnect.map.in

@@ -50,6 +50,7 @@ OPENCONNECT_3.1 {
 	openconnect_get_ip_info;
 	openconnect_set_protect_socket_handler;
 	openconnect_set_mobile_info;
+	openconnect_set_xmlpost;
 } OPENCONNECT_3.0;
 
 OPENCONNECT_PRIVATE {

library.c

@@ -283,6 +283,11 @@ void openconnect_setup_csd(struct openconnect_info *vpninfo, uid_t uid, int sile
 	vpninfo->csd_wrapper = wrapper;
 }
 
+void openconnect_set_xmlpost(struct openconnect_info *vpninfo, int enable)
+{
+	vpninfo->xmlpost = enable;
+}
+
 void openconnect_set_client_cert(struct openconnect_info *vpninfo, char *cert, char *sslkey)
 {
 	vpninfo->cert = cert;

main.c

@@ -603,7 +603,7 @@ int main(int argc, char **argv)
 			vpninfo->nopasswd = 1;
 			break;
 		case OPT_NO_XMLPOST:
-			vpninfo->xmlpost = 0;
+			openconnect_set_xmlpost(vpninfo, 0);
 			break;
 		case OPT_NON_INTER:
 			non_inter = 1;

openconnect.h

@@ -251,6 +251,7 @@ void openconnect_set_xmlsha1(struct openconnect_info *, const char *, int size);
 
 void openconnect_set_cafile(struct openconnect_info *, char *);
 void openconnect_setup_csd(struct openconnect_info *, uid_t, int silent, char *wrapper);
+void openconnect_set_xmlpost(struct openconnect_info *, int enable);
 int openconnect_set_reported_os(struct openconnect_info *, const char *os);
 void openconnect_set_mobile_info(struct openconnect_info *vpninfo,
 				 char *mobile_platform_version,