trigger periodic TNCC even if we have no packets to receive from oNCP…

…, and don't use server's interval if zero

Signed-off-by: Daniel Lenski <dlenski@gmail.com>

auth-juniper.c

@@ -498,7 +498,7 @@ static int tncc_preauth(struct openconnect_info *vpninfo)
 		goto respfail;
 	if (len > 0) {
 		int interval = atoi(recvbuf);
-		if (interval != vpninfo->trojan_interval) {
+		if (interval != 0) {
 			vpninfo->trojan_interval = interval;
 			vpn_progress(vpninfo, PRG_DEBUG,
 				     _("Got reauth interval from TNCC: %d seconds\n"),

oncp.c

@@ -899,6 +899,12 @@ int oncp_mainloop(struct openconnect_info *vpninfo, int *timeout, int readable)
 	int ret;
 	int work_done = 0;
 
+	/* Periodic TNCC */
+	if (trojan_check_deadline(vpninfo, timeout)) {
+		oncp_send_tncc_command(vpninfo, 0);
+		return 1;
+	}
+
 	if (vpninfo->ssl_fd == -1)
 		goto do_reconnect;
 
@@ -915,11 +921,6 @@ int oncp_mainloop(struct openconnect_info *vpninfo, int *timeout, int readable)
 		   handle that */
 		int receive_mtu = MAX(16384, vpninfo->ip_info.mtu);
 
-		if (trojan_check_deadline(vpninfo, timeout)) {
-			/* Periodic TNCC */
-			oncp_send_tncc_command(vpninfo, 0);
-		}
-
 		len = receive_mtu + vpninfo->pkt_trailer;
 		if (!vpninfo->cstp_pkt) {
 			vpninfo->cstp_pkt = malloc(sizeof(struct pkt) + len);