static tb_long_t tb_dns_looker_resp(tb_dns_looker_impl_t* impl, tb_ipaddr_ref_t addr) { // check tb_check_return_val(!(impl->step & TB_DNS_LOOKER_STEP_RESP), 1); // need wait if no data impl->step &= ~TB_DNS_LOOKER_STEP_NEVT; // recv response data tb_byte_t rpkt[4096]; while (1) { // read data tb_long_t read = tb_socket_urecv(impl->sock, tb_null, rpkt, 4096); //tb_trace_d("read %d", read); tb_assert_and_check_return_val(read >= 0, -1); // no data? if (!read) { // end? read x, read 0 tb_check_break(!tb_static_buffer_size(&impl->rpkt)); // abort? read 0, read 0 tb_check_return_val(!impl->tryn, -1); // tryn++ impl->tryn++; // continue return 0; } else impl->tryn = 0; // copy data tb_static_buffer_memncat(&impl->rpkt, rpkt, read); } // done if (!tb_dns_looker_resp_done(impl, addr)) return -1; // check tb_assert_and_check_return_val(tb_static_string_size(&impl->name) && !tb_ipaddr_ip_is_empty(addr), -1); // save address to cache tb_dns_cache_set(tb_static_string_cstr(&impl->name), addr); // finish it impl->step |= TB_DNS_LOOKER_STEP_RESP; impl->tryn = 0; // reset rpkt impl->size = 0; tb_static_buffer_clear(&impl->rpkt); // ok tb_trace_d("response: ok"); return 1; }
tb_long_t tb_dns_looker_spak(tb_dns_looker_ref_t self, tb_ipaddr_ref_t addr) { // check tb_dns_looker_t* looker = (tb_dns_looker_t*)self; tb_assert_and_check_return_val(looker && addr, -1); // init tb_long_t r = -1; do { // request r = tb_dns_looker_reqt(looker); tb_check_break(r > 0); // response r = tb_dns_looker_resp(looker, addr); tb_check_break(r > 0); } while (0); // failed? if (r < 0) { // next if (looker->itor + 1 <= looker->maxn) looker->itor++; else looker->itor = 0; // has next? if (looker->itor) { // reset step, no event now, need not wait looker->step = TB_DNS_LOOKER_STEP_NONE | TB_DNS_LOOKER_STEP_NEVT; // reset rpkt looker->size = 0; tb_static_buffer_clear(&looker->rpkt); // continue r = 0; } } // ok? return r; }
static tb_long_t tb_dns_looker_resp(tb_dns_looker_t* looker, tb_ipaddr_ref_t addr) { // check tb_check_return_val(!(looker->step & TB_DNS_LOOKER_STEP_RESP), 1); // need wait if no data looker->step &= ~TB_DNS_LOOKER_STEP_NEVT; // recv response data tb_size_t size = tb_static_buffer_size(&looker->rpkt); tb_size_t maxn = tb_static_buffer_maxn(&looker->rpkt); tb_byte_t* data = tb_static_buffer_data(&looker->rpkt); while (size < maxn) { // read data tb_long_t read = tb_socket_urecv(looker->sock, tb_null, data + size, maxn - size); tb_assert_and_check_return_val(read >= 0, -1); // no data? if (!read) { // end? read x, read 0 tb_check_break(!tb_static_buffer_size(&looker->rpkt)); // abort? read 0, read 0 tb_check_return_val(!looker->tryn, -1); // tryn++ looker->tryn++; // continue return 0; } else looker->tryn = 0; // update buffer size tb_static_buffer_resize(&looker->rpkt, size + read); size = tb_static_buffer_size(&looker->rpkt); } // done if (!tb_dns_looker_resp_done(looker, addr)) return -1; // check tb_assert_and_check_return_val(tb_static_string_size(&looker->name) && !tb_ipaddr_ip_is_empty(addr), -1); // save address to cache tb_dns_cache_set(tb_static_string_cstr(&looker->name), addr); // finish it looker->step |= TB_DNS_LOOKER_STEP_RESP; looker->tryn = 0; // reset rpkt looker->size = 0; tb_static_buffer_clear(&looker->rpkt); // ok tb_trace_d("response: ok"); return 1; }
/* ////////////////////////////////////////////////////////////////////////////////////// * implementation */ static tb_long_t tb_dns_looker_reqt(tb_dns_looker_t* looker) { // check tb_check_return_val(!(looker->step & TB_DNS_LOOKER_STEP_REQT), 1); // format it first if the request is null if (!tb_static_buffer_size(&looker->rpkt)) { // check size tb_assert_and_check_return_val(!looker->size, -1); // format query tb_static_stream_t stream; tb_byte_t rpkt[TB_DNS_RPKT_MAXN]; tb_size_t size = 0; tb_byte_t* p = tb_null; tb_static_stream_init(&stream, rpkt, TB_DNS_RPKT_MAXN); // identification number tb_static_stream_writ_u16_be(&stream, TB_DNS_HEADER_MAGIC); /* 0x2104: 0 0000 001 0000 0000 * * tb_uint16_t qr :1; // query/response flag * tb_uint16_t opcode :4; // purpose of message * tb_uint16_t aa :1; // authoritive answer * tb_uint16_t tc :1; // truncated message * tb_uint16_t rd :1; // recursion desired * tb_uint16_t ra :1; // recursion available * tb_uint16_t z :1; // its z! reserved * tb_uint16_t ad :1; // authenticated data * tb_uint16_t cd :1; // checking disabled * tb_uint16_t rcode :4; // response code * * this is a query * this is a standard query * not authoritive answer * not truncated * recursion desired * * recursion not available! hey we dont have it (lol) * */ #if 1 tb_static_stream_writ_u16_be(&stream, 0x0100); #else tb_static_stream_writ_u1(&stream, 0); // this is a query tb_static_stream_writ_ubits32(&stream, 0, 4); // this is a standard query tb_static_stream_writ_u1(&stream, 0); // not authoritive answer tb_static_stream_writ_u1(&stream, 0); // not truncated tb_static_stream_writ_u1(&stream, 1); // recursion desired tb_static_stream_writ_u1(&stream, 0); // recursion not available! hey we dont have it (lol) tb_static_stream_writ_u1(&stream, 0); tb_static_stream_writ_u1(&stream, 0); tb_static_stream_writ_u1(&stream, 0); tb_static_stream_writ_ubits32(&stream, 0, 4); #endif /* we have only one question * * tb_uint16_t question; // number of question entries * tb_uint16_t answer; // number of answer entries * tb_uint16_t authority; // number of authority entries * tb_uint16_t resource; // number of resource entries * */ tb_static_stream_writ_u16_be(&stream, 1); tb_static_stream_writ_u16_be(&stream, 0); tb_static_stream_writ_u16_be(&stream, 0); tb_static_stream_writ_u16_be(&stream, 0); // set questions, see as tb_dns_question_t // name + question1 + question2 + ... tb_static_stream_writ_u8(&stream, '.'); p = (tb_byte_t*)tb_static_stream_writ_cstr(&stream, tb_static_string_cstr(&looker->name)); // only one question now. tb_static_stream_writ_u16_be(&stream, 1); // we are requesting the ipv4 address tb_static_stream_writ_u16_be(&stream, 1); // it's internet (lol) // encode dns name if (!p || !tb_dns_encode_name((tb_char_t*)p - 1)) return -1; // size size = tb_static_stream_offset(&stream); tb_assert_and_check_return_val(size, -1); // copy tb_static_buffer_memncpy(&looker->rpkt, rpkt, size); } // data && size tb_byte_t const* data = tb_static_buffer_data(&looker->rpkt); tb_size_t size = tb_static_buffer_size(&looker->rpkt); // check tb_assert_and_check_return_val(data && size && looker->size < size, -1); // try get addr from the dns list tb_ipaddr_ref_t addr = tb_null; if (looker->maxn && looker->itor && looker->itor <= looker->maxn) addr = &looker->list[looker->itor - 1]; // check tb_assert_and_check_return_val(addr && !tb_ipaddr_is_empty(addr), -1); // family have been changed? reinit socket if (tb_ipaddr_family(addr) != looker->family) { // exit the previous socket if (looker->sock) tb_socket_exit(looker->sock); // init a new socket for the family looker->sock = tb_socket_init(TB_SOCKET_TYPE_UDP, tb_ipaddr_family(addr)); tb_assert_and_check_return_val(looker->sock, -1); // update the new family looker->family = (tb_uint8_t)tb_ipaddr_family(addr); } // need wait if no data looker->step &= ~TB_DNS_LOOKER_STEP_NEVT; // trace tb_trace_d("request: try %{ipaddr}", addr); // send request while (looker->size < size) { // writ data tb_long_t writ = tb_socket_usend(looker->sock, addr, data + looker->size, size - looker->size); tb_assert_and_check_return_val(writ >= 0, -1); // no data? if (!writ) { // abort? tb_check_return_val(!looker->size && !looker->tryn, -1); // tryn++ looker->tryn++; // continue return 0; } else looker->tryn = 0; // update size looker->size += writ; } // finish it looker->step |= TB_DNS_LOOKER_STEP_REQT; looker->tryn = 0; // reset rpkt looker->size = 0; tb_static_buffer_clear(&looker->rpkt); // ok tb_trace_d("request: ok"); return 1; }