From 0d08dde62e79e293a56b3d64f4e73a25beb75d76 Mon Sep 17 00:00:00 2001 From: Nick Moore Date: Fri, 10 May 2019 13:56:33 +1000 Subject: randomize tcp source port for adafruit/circuitpython#1800 --- shared-module/wiznet/wiznet5k.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'shared-module/wiznet') diff --git a/shared-module/wiznet/wiznet5k.c b/shared-module/wiznet/wiznet5k.c index dbd483451..3c5c5f0c8 100644 --- a/shared-module/wiznet/wiznet5k.c +++ b/shared-module/wiznet/wiznet5k.c @@ -203,8 +203,12 @@ int wiznet5k_socket_accept(mod_network_socket_obj_t *socket, mod_network_socket_ } int wiznet5k_socket_connect(mod_network_socket_obj_t *socket, byte *ip, mp_uint_t port, int *_errno) { + uint16_t src_port = network_module_create_random_source_tcp_port(); + // make sure same outgoing port number can't be in use by two different sockets. + src_port = (src_port & ~(_WIZCHIP_SOCK_NUM_ - 1)) | socket->u_param.fileno; + // use "bind" function to open the socket in client mode - if (wiznet5k_socket_bind(socket, ip, 0, _errno) != 0) { + if (wiznet5k_socket_bind(socket, NULL, src_port, _errno) != 0) { return -1; } -- cgit v1.2.3