unix: modsocket: Implement sendto().
sendto() turns out to be mandatory function to work with UDP. It may seem that connect(addr) + send() would achieve the same effect, but what connect() appears to do is to set source address filter on a socket to its argument. Then everything falls apart: socket sends to a broad-/multi-cast address, but reply is sent from real peer address, which doesn't match filter set by connect(), so local socket never sees a reply.
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@ -206,6 +206,27 @@ STATIC mp_obj_t socket_send(mp_uint_t n_args, const mp_obj_t *args) {
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(socket_send_obj, 2, 3, socket_send);
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STATIC mp_obj_t socket_sendto(mp_uint_t n_args, const mp_obj_t *args) {
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mp_obj_socket_t *self = args[0];
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int flags = 0;
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mp_obj_t dst_addr = args[2];
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if (n_args > 3) {
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flags = MP_OBJ_SMALL_INT_VALUE(args[2]);
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dst_addr = args[3];
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}
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mp_buffer_info_t bufinfo, addr_bi;
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mp_get_buffer_raise(args[1], &bufinfo, MP_BUFFER_READ);
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mp_get_buffer_raise(dst_addr, &addr_bi, MP_BUFFER_READ);
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int out_sz = sendto(self->fd, bufinfo.buf, bufinfo.len, flags,
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(struct sockaddr *)addr_bi.buf, addr_bi.len);
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RAISE_ERRNO(out_sz, errno);
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return MP_OBJ_NEW_SMALL_INT(out_sz);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(socket_sendto_obj, 3, 4, socket_sendto);
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STATIC mp_obj_t socket_setsockopt(mp_uint_t n_args, const mp_obj_t *args) {
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(void)n_args; // always 4
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mp_obj_socket_t *self = args[0];
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@ -300,6 +321,7 @@ STATIC const mp_map_elem_t usocket_locals_dict_table[] = {
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{ MP_OBJ_NEW_QSTR(MP_QSTR_accept), (mp_obj_t)&socket_accept_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_recv), (mp_obj_t)&socket_recv_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_send), (mp_obj_t)&socket_send_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_sendto), (mp_obj_t)&socket_sendto_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_setsockopt), (mp_obj_t)&socket_setsockopt_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_setblocking), (mp_obj_t)&socket_setblocking_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_close), (mp_obj_t)&socket_close_obj },
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@ -70,6 +70,7 @@ Q(bind)
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Q(listen)
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Q(accept)
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Q(recv)
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Q(sendto)
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Q(setsockopt)
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Q(setblocking)
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