/**
@brief Report whether a transport_client is connected.
@param client Pointer to the transport_client.
@return Boolean: 1 if connected, or 0 if not.
*/
int client_connected( const transport_client* client ) {
if(client == NULL) return 0;
return session_connected( client->session );
}
static void global_cb(EV_P_ ev_io *w, int revents) {
global_context *gc = (global_context *)w->data;
static int count = 0;
int ret = 0;
struct sockaddr_storage local_addr;
socklen_t local_addr_size = sizeof(local_addr);
log_debug("global_cb fds: %d,%d revents: 0x%02x count: %d", w->fd, gc->listen_fd.fd, revents, count);
count++;
ret = getsockname(gc->listen_fd.fd, (struct sockaddr *)&local_addr, &local_addr_size);
if (ret < 0) {
log_error("getsockname() failed errno=%d", ret, errno);
return;
}
/* Read all the incoming packets waiting on listen_fd, and create a session for each one */
for (;;) {
mbedtls_net_context client_fd;
session_context *sc;
struct sockaddr_storage client_addr;
socklen_t client_addr_size = sizeof(client_addr);
unsigned char first_packet[MBEDTLS_SSL_MAX_CONTENT_LEN];
size_t first_packet_len = 0;
ret = recvfrom(gc->listen_fd.fd, first_packet, sizeof(first_packet), 0,
(struct sockaddr *)&client_addr, &client_addr_size);
if (ret < 0) {
int save_errno = errno;
if ((save_errno == EAGAIN) || (save_errno == EWOULDBLOCK)) {
/* We finished reading everything that was available so far */
return;
}
log_error("recvfrom failed on listening socket (fd=%d), errno=%d", gc->listen_fd.fd,
save_errno);
return;
} else if (ret == 0) {
log_error("recvfrom() returned 0, this shouldn't happen");
continue;
}
first_packet_len = ret;
/* We have a new client! Connect the client_fd socket to that peer */
ret = connect_to_new_client(&client_fd,
&client_addr, client_addr_size,
&local_addr, local_addr_size);
if (ret != 0) {
log_error("connect_to_new_client failed");
continue;
}
if (active_session_context != NULL) {
session_free(EV_A_ active_session_context);
active_session_context = NULL;
}
sc = calloc(1, sizeof(session_context));
session_init(gc, sc, &client_fd, (unsigned char *)&client_addr, client_addr_size,
first_packet, first_packet_len);
if (session_connected(sc) != 0) {
log_error("can't init client connection");
free(sc);
continue;
}
active_session_context = sc;
/* Start listening for network events on the new client fd */
session_start(sc, EV_A);
log_debug("global_cb - session_start - client_fd %d", sc->client_fd.fd);
/* Trigger the FSM drive and start DTLS negotiation to backend, and
* during this time, we just silently drop the first packet from
* vpn client.
*/
ev_feed_fd_event(EV_A_ sc->backend_fd.fd, EV_READ);
}
}