csd: Export some useful environment variables

CSD_HOSTNAME is a known-valid hostname on which (hopefully) our script
won't have to perform too much input validation to know it's safe.

CSD_TOKEN is passed in as the "sdesktop" cookie from host scan.

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

http.c

@@ -603,6 +603,11 @@ static int run_csd_script(struct openconnect_info *vpninfo, char *buf, int bufle
 		csd_argv[i++]= (char *)"-langselen";
 		csd_argv[i++] = NULL;
 
+		if (setenv("CSD_TOKEN", vpninfo->csd_token, 1))
+			goto out;
+		if (setenv("CSD_HOSTNAME", vpninfo->hostname, 1))
+			goto out;
+
 		execv(csd_argv[0], csd_argv);
 
 out: