From 964d679edc32b0f7316cacdb0652477d607f6de5 Mon Sep 17 00:00:00 2001 From: Alexander Polcyn Date: Tue, 21 Aug 2018 08:00:49 -0700 Subject: Resolve ip literals and Windows localhost manually when using c-ares --- .../resolver/dns/c_ares/grpc_ares_wrapper.cc | 99 +++++++++++++++++----- 1 file changed, 80 insertions(+), 19 deletions(-) (limited to 'src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.cc') 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..4c795c34c8 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(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++; } @@ -371,7 +356,8 @@ done: grpc_ares_request_unref_locked(r); } -static grpc_ares_request* grpc_dns_lookup_ares_locked_impl( +static grpc_ares_request* +grpc_dns_lookup_ares_continue_after_check_localhost_and_ip_literals_locked( 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, @@ -454,12 +440,12 @@ 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); @@ -494,6 +480,79 @@ error_cleanup: return nullptr; } +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); + 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) { + // 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 nullptr; + } + // 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 nullptr; + } + // Look up name using c-ares lib. + return grpc_dns_lookup_ares_continue_after_check_localhost_and_ip_literals_locked( + dns_server, name, default_port, interested_parties, on_done, addrs, + check_grpclb, service_config_json, combiner); +} + grpc_ares_request* (*grpc_dns_lookup_ares_locked)( const char* dns_server, const char* name, const char* default_port, grpc_pollset_set* interested_parties, grpc_closure* on_done, @@ -502,7 +561,9 @@ grpc_ares_request* (*grpc_dns_lookup_ares_locked)( void grpc_cancel_ares_request(grpc_ares_request* r) { if (grpc_dns_lookup_ares_locked == grpc_dns_lookup_ares_locked_impl) { - grpc_ares_ev_driver_shutdown_locked(r->ev_driver); + if (r != nullptr) { + grpc_ares_ev_driver_shutdown_locked(r->ev_driver); + } } } -- cgit v1.2.3