struct bufferevent* red_connect_relay(struct sockaddr_in *addr, evbuffercb writecb, everrorcb errorcb, void *cbarg)
{
struct bufferevent *retval = NULL;
int relay_fd = -1;
int error;
relay_fd = socket(AF_INET, SOCK_STREAM, 0);
if (relay_fd == -1) {
log_errno(LOG_ERR, "socket");
goto fail;
}
error = fcntl_nonblock(relay_fd);
if (error) {
log_errno(LOG_ERR, "fcntl");
goto fail;
}
if (apply_tcp_keepalive(relay_fd))
goto fail;
error = connect(relay_fd, (struct sockaddr*)addr, sizeof(*addr));
if (error && errno != EINPROGRESS) {
log_errno(LOG_NOTICE, "connect");
goto fail;
}
retval = bufferevent_new(relay_fd, NULL, writecb, errorcb, cbarg);
if (!retval) {
log_errno(LOG_ERR, "bufferevent_new");
goto fail;
}
error = bufferevent_enable(retval, EV_WRITE); // we wait for connection...
if (error) {
log_errno(LOG_ERR, "bufferevent_enable");
goto fail;
}
return retval;
fail:
if (relay_fd != -1)
redsocks_close(relay_fd);
if (retval)
bufferevent_free(retval);
return NULL;
}
struct bufferevent* red_prepare_relay(const char *ifname,
bufferevent_data_cb readcb,
bufferevent_data_cb writecb,
bufferevent_event_cb errorcb,
void *cbarg)
{
struct bufferevent *retval = NULL;
int relay_fd = -1;
int error;
relay_fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (relay_fd == -1) {
log_errno(LOG_ERR, "socket");
goto fail;
}
if (ifname && strlen(ifname)) {
#ifdef USE_PF // BSD
error = setsockopt(relay_fd, SOL_SOCKET, IP_RECVIF, ifname, strlen(ifname));
#else // Linux
error = setsockopt(relay_fd, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname));
#endif
if (error) {
log_errno(LOG_ERR, "setsockopt");
goto fail;
}
}
error = evutil_make_socket_nonblocking(relay_fd);
if (error) {
log_errno(LOG_ERR, "evutil_make_socket_nonblocking");
goto fail;
}
retval = bufferevent_socket_new(get_event_base(), relay_fd, 0);
if (!retval) {
log_errno(LOG_ERR, "bufferevent_socket_new");
goto fail;
}
bufferevent_setcb(retval, readcb, writecb, errorcb, cbarg);
if (writecb) {
error = bufferevent_enable(retval, EV_WRITE); // we wait for connection...
if (error) {
log_errno(LOG_ERR, "bufferevent_enable");
goto fail;
}
}
if (apply_tcp_keepalive(relay_fd))
goto fail;
return retval;
fail:
if (retval){
bufferevent_disable(retval, EV_READ|EV_WRITE);
bufferevent_free(retval);
}
if (relay_fd != -1)
redsocks_close(relay_fd);
return NULL;
}