extmod/modlwip: Fix for loss of data in unaccepted incoming sockets.

When lwIP creates a incoming connection socket of a listen socket, it
sets its recv callback to one which discards incoming data. We set
proper callback only in accept() call, when we allocate Python-level
socket where we can queue incoming data. So, in lwIP accept callback
be sure to set recv callback to one which tells lwIP to not discard
incoming data.
crypto-aes
Paul Sokolovsky 7 years ago
parent 1cc81ed449
commit 7063210014

@ -288,9 +288,19 @@ STATIC err_t _lwip_tcp_connected(void *arg, struct tcp_pcb *tpcb, err_t err) {
return ERR_OK;
}
// By default, a child socket of listen socket is created with recv
// handler which discards incoming pbuf's. We don't want to do that,
// so set this handler which requests lwIP to keep pbuf's and deliver
// them later. We cannot cache pbufs in child socket on Python side,
// until it is created in accept().
STATIC err_t _lwip_tcp_recv_unaccepted(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err) {
return ERR_BUF;
}
// Callback for incoming tcp connections.
STATIC err_t _lwip_tcp_accept(void *arg, struct tcp_pcb *newpcb, err_t err) {
lwip_socket_obj_t *socket = (lwip_socket_obj_t*)arg;
tcp_recv(newpcb, _lwip_tcp_recv_unaccepted);
if (socket->incoming.connection != NULL) {
// We need to handle this better. This single-level structure makes the

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