Improve proxy server support

[tinc] / src / protocol_misc.c

diff --git a/src/protocol_misc.c b/src/protocol_misc.c
index cef7e3d..0263d00 100644 (file)
--- a/src/protocol_misc.c
+++ b/src/protocol_misc.c
@@ -104,7 +104,7 @@ bool send_tcppacket(connection_t *c, const vpn_packet_t *packet) {
 bool tcppacket_h(connection_t *c, const char *request) {
        short int len;
 
-       if(sscanf(request, "%*d %hd", &len) != 1) {
+       if(sscanf(request, "%*d %hd", &len) != 1 || len < 0) {
                logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "PACKET", c->name,
                       c->hostname);
                return false;
@@ -136,7 +136,7 @@ bool send_sptps_tcppacket(connection_t *c, const void *packet, size_t len) {
 bool sptps_tcppacket_h(connection_t *c, const char *request) {
        short int len;
 
-       if(sscanf(request, "%*d %hd", &len) != 1) {
+       if(sscanf(request, "%*d %hd", &len) != 1 || len < 0) {
                logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "SPTPS_PACKET", c->name,
                       c->hostname);
                return false;