diff options
Diffstat (limited to 'src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.cc')
-rw-r--r-- | src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.cc | 157 |
1 files changed, 110 insertions, 47 deletions
diff --git a/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.cc b/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.cc index 485998f5e4..582e2203fc 100644 --- a/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.cc +++ b/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.cc @@ -87,15 +87,6 @@ typedef struct grpc_ares_hostbyname_request { static void do_basic_init(void) { gpr_mu_init(&g_init_mu); } -static uint16_t strhtons(const char* port) { - if (strcmp(port, "http") == 0) { - return htons(80); - } else if (strcmp(port, "https") == 0) { - return htons(443); - } - return htons(static_cast<unsigned short>(atoi(port))); -} - static void log_address_sorting_list(grpc_lb_addresses* lb_addrs, const char* input_output_str) { for (size_t i = 0; i < lb_addrs->num_addresses; i++) { @@ -139,12 +130,6 @@ void grpc_cares_wrapper_address_sorting_sort(grpc_lb_addresses* lb_addrs) { } } -/* Allow tests to access grpc_ares_wrapper_address_sorting_sort */ -void grpc_cares_wrapper_test_only_address_sorting_sort( - grpc_lb_addresses* lb_addrs) { - grpc_cares_wrapper_address_sorting_sort(lb_addrs); -} - static void grpc_ares_request_ref_locked(grpc_ares_request* r) { r->pending_queries++; } @@ -159,12 +144,12 @@ static void grpc_ares_request_unref_locked(grpc_ares_request* r) { void grpc_ares_complete_request_locked(grpc_ares_request* r) { /* Invoke on_done callback and destroy the request */ + r->ev_driver = nullptr; grpc_lb_addresses* lb_addrs = *(r->lb_addrs_out); if (lb_addrs != nullptr) { grpc_cares_wrapper_address_sorting_sort(lb_addrs); } GRPC_CLOSURE_SCHED(r->on_done, r->error); - gpr_free(r); } static grpc_ares_hostbyname_request* create_hostbyname_request_locked( @@ -371,14 +356,12 @@ done: grpc_ares_request_unref_locked(r); } -static grpc_ares_request* grpc_dns_lookup_ares_locked_impl( - const char* dns_server, const char* name, const char* default_port, - grpc_pollset_set* interested_parties, grpc_closure* on_done, - grpc_lb_addresses** addrs, bool check_grpclb, char** service_config_json, - grpc_combiner* combiner) { +void grpc_dns_lookup_ares_continue_after_check_localhost_and_ip_literals_locked( + grpc_ares_request* r, const char* dns_server, const char* name, + const char* default_port, grpc_pollset_set* interested_parties, + bool check_grpclb, grpc_combiner* combiner) { grpc_error* error = GRPC_ERROR_NONE; grpc_ares_hostbyname_request* hr = nullptr; - grpc_ares_request* r = nullptr; ares_channel* channel = nullptr; /* TODO(zyc): Enable tracing after #9603 is checked in */ /* if (grpc_dns_trace) { @@ -404,14 +387,6 @@ static grpc_ares_request* grpc_dns_lookup_ares_locked_impl( } port = gpr_strdup(default_port); } - r = static_cast<grpc_ares_request*>(gpr_zalloc(sizeof(grpc_ares_request))); - r->ev_driver = nullptr; - r->on_done = on_done; - r->lb_addrs_out = addrs; - r->service_config_json_out = service_config_json; - r->success = false; - r->error = GRPC_ERROR_NONE; - r->pending_queries = 0; error = grpc_ares_ev_driver_create_locked(&r->ev_driver, interested_parties, combiner, r); if (error != GRPC_ERROR_NONE) goto error_cleanup; @@ -454,12 +429,12 @@ static grpc_ares_request* grpc_dns_lookup_ares_locked_impl( } r->pending_queries = 1; if (grpc_ares_query_ipv6()) { - hr = create_hostbyname_request_locked(r, host, strhtons(port), + hr = create_hostbyname_request_locked(r, host, grpc_strhtons(port), false /* is_balancer */); ares_gethostbyname(*channel, hr->host, AF_INET6, on_hostbyname_done_locked, hr); } - hr = create_hostbyname_request_locked(r, host, strhtons(port), + hr = create_hostbyname_request_locked(r, host, grpc_strhtons(port), false /* is_balancer */); ares_gethostbyname(*channel, hr->host, AF_INET, on_hostbyname_done_locked, hr); @@ -472,7 +447,7 @@ static grpc_ares_request* grpc_dns_lookup_ares_locked_impl( on_srv_query_done_locked, r); gpr_free(service_name); } - if (service_config_json != nullptr) { + if (r->service_config_json_out != nullptr) { grpc_ares_request_ref_locked(r); char* config_name; gpr_asprintf(&config_name, "_grpc_config.%s", host); @@ -484,14 +459,95 @@ static grpc_ares_request* grpc_dns_lookup_ares_locked_impl( grpc_ares_request_unref_locked(r); gpr_free(host); gpr_free(port); - return r; + return; error_cleanup: - GRPC_CLOSURE_SCHED(on_done, error); - gpr_free(r); + GRPC_CLOSURE_SCHED(r->on_done, error); + gpr_free(host); + gpr_free(port); +} + +static bool inner_resolve_as_ip_literal_locked(const char* name, + const char* default_port, + grpc_lb_addresses** addrs, + char** host, char** port, + char** hostport) { + gpr_split_host_port(name, host, port); + if (*host == nullptr) { + gpr_log(GPR_ERROR, + "Failed to parse %s to host:port while attempting to resolve as ip " + "literal.", + name); + return false; + } + if (*port == nullptr) { + if (default_port == nullptr) { + gpr_log(GPR_ERROR, + "No port or default port for %s while attempting to resolve as " + "ip literal.", + name); + return false; + } + *port = gpr_strdup(default_port); + } + grpc_resolved_address addr; + GPR_ASSERT(gpr_join_host_port(hostport, *host, atoi(*port))); + if (grpc_parse_ipv4_hostport(*hostport, &addr, false /* log errors */) || + grpc_parse_ipv6_hostport(*hostport, &addr, false /* log errors */)) { + GPR_ASSERT(*addrs == nullptr); + *addrs = grpc_lb_addresses_create(1, nullptr); + grpc_lb_addresses_set_address( + *addrs, 0, addr.addr, addr.len, false /* is_balancer */, + nullptr /* balancer_name */, nullptr /* user_data */); + return true; + } + return false; +} + +static bool resolve_as_ip_literal_locked(const char* name, + const char* default_port, + grpc_lb_addresses** addrs) { + char* host = nullptr; + char* port = nullptr; + char* hostport = nullptr; + bool out = inner_resolve_as_ip_literal_locked(name, default_port, addrs, + &host, &port, &hostport); gpr_free(host); gpr_free(port); - return nullptr; + gpr_free(hostport); + return out; +} + +static grpc_ares_request* grpc_dns_lookup_ares_locked_impl( + const char* dns_server, const char* name, const char* default_port, + grpc_pollset_set* interested_parties, grpc_closure* on_done, + grpc_lb_addresses** addrs, bool check_grpclb, char** service_config_json, + grpc_combiner* combiner) { + grpc_ares_request* r = + static_cast<grpc_ares_request*>(gpr_zalloc(sizeof(grpc_ares_request))); + r->ev_driver = nullptr; + r->on_done = on_done; + r->lb_addrs_out = addrs; + r->service_config_json_out = service_config_json; + r->success = false; + r->error = GRPC_ERROR_NONE; + r->pending_queries = 0; + // Early out if the target is an ipv4 or ipv6 literal. + if (resolve_as_ip_literal_locked(name, default_port, addrs)) { + GRPC_CLOSURE_SCHED(on_done, GRPC_ERROR_NONE); + return r; + } + // Early out if the target is localhost and we're on Windows. + if (grpc_ares_maybe_resolve_localhost_manually_locked(name, default_port, + addrs)) { + GRPC_CLOSURE_SCHED(on_done, GRPC_ERROR_NONE); + return r; + } + // Look up name using c-ares lib. + grpc_dns_lookup_ares_continue_after_check_localhost_and_ip_literals_locked( + r, dns_server, name, default_port, interested_parties, check_grpclb, + combiner); + return r; } grpc_ares_request* (*grpc_dns_lookup_ares_locked)( @@ -500,12 +556,16 @@ grpc_ares_request* (*grpc_dns_lookup_ares_locked)( grpc_lb_addresses** addrs, bool check_grpclb, char** service_config_json, grpc_combiner* combiner) = grpc_dns_lookup_ares_locked_impl; -void grpc_cancel_ares_request(grpc_ares_request* r) { - if (grpc_dns_lookup_ares_locked == grpc_dns_lookup_ares_locked_impl) { +static void grpc_cancel_ares_request_locked_impl(grpc_ares_request* r) { + GPR_ASSERT(r != nullptr); + if (r->ev_driver != nullptr) { grpc_ares_ev_driver_shutdown_locked(r->ev_driver); } } +void (*grpc_cancel_ares_request_locked)(grpc_ares_request* r) = + grpc_cancel_ares_request_locked_impl; + grpc_error* grpc_ares_init(void) { gpr_once_init(&g_basic_init, do_basic_init); gpr_mu_lock(&g_init_mu); @@ -542,20 +602,23 @@ typedef struct grpc_resolve_address_ares_request { grpc_lb_addresses* lb_addrs; /** closure to call when the resolve_address_ares request completes */ grpc_closure* on_resolve_address_done; - /** a closure wrapping on_dns_lookup_done_cb, which should be invoked when the - grpc_dns_lookup_ares_locked operation is done. */ - grpc_closure on_dns_lookup_done; + /** a closure wrapping on_resolve_address_done, which should be invoked when + the grpc_dns_lookup_ares_locked operation is done. */ + grpc_closure on_dns_lookup_done_locked; /* target name */ const char* name; /* default port to use if none is specified */ const char* default_port; /* pollset_set to be driven by */ grpc_pollset_set* interested_parties; + /* underlying ares_request that the query is performed on */ + grpc_ares_request* ares_request; } grpc_resolve_address_ares_request; -static void on_dns_lookup_done_cb(void* arg, grpc_error* error) { +static void on_dns_lookup_done_locked(void* arg, grpc_error* error) { grpc_resolve_address_ares_request* r = static_cast<grpc_resolve_address_ares_request*>(arg); + gpr_free(r->ares_request); grpc_resolved_addresses** resolved_addresses = r->addrs_out; if (r->lb_addrs == nullptr || r->lb_addrs->num_addresses == 0) { *resolved_addresses = nullptr; @@ -582,9 +645,9 @@ static void grpc_resolve_address_invoke_dns_lookup_ares_locked( void* arg, grpc_error* unused_error) { grpc_resolve_address_ares_request* r = static_cast<grpc_resolve_address_ares_request*>(arg); - grpc_dns_lookup_ares_locked( + r->ares_request = grpc_dns_lookup_ares_locked( nullptr /* dns_server */, r->name, r->default_port, r->interested_parties, - &r->on_dns_lookup_done, &r->lb_addrs, false /* check_grpclb */, + &r->on_dns_lookup_done_locked, &r->lb_addrs, false /* check_grpclb */, nullptr /* service_config_json */, r->combiner); } @@ -599,8 +662,8 @@ static void grpc_resolve_address_ares_impl(const char* name, r->combiner = grpc_combiner_create(); r->addrs_out = addrs; r->on_resolve_address_done = on_done; - GRPC_CLOSURE_INIT(&r->on_dns_lookup_done, on_dns_lookup_done_cb, r, - grpc_schedule_on_exec_ctx); + GRPC_CLOSURE_INIT(&r->on_dns_lookup_done_locked, on_dns_lookup_done_locked, r, + grpc_combiner_scheduler(r->combiner)); r->name = name; r->default_port = default_port; r->interested_parties = interested_parties; |