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// Copyright 2024 The gRPC Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <grpc/support/port_platform.h>
#ifdef GPR_WINDOWS
#include <inttypes.h>
#include <string.h>
#include <sys/types.h>
#include <string>
#include "absl/strings/str_format.h"
#include <grpc/event_engine/event_engine.h>
#include "src/core/lib/event_engine/windows/native_windows_dns_resolver.h"
#include "src/core/lib/gprpp/host_port.h"
#include "src/core/lib/gprpp/status_helper.h"
#include "src/core/lib/iomgr/error.h"
namespace grpc_event_engine {
namespace experimental {
namespace {
absl::StatusOr<std::vector<EventEngine::ResolvedAddress>>
LookupHostnameBlocking(absl::string_view name, absl::string_view default_port) {
std::vector<EventEngine::ResolvedAddress> addresses;
// parse name, splitting it into host and port parts
std::string host;
std::string port;
grpc_core::SplitHostPort(name, &host, &port);
if (host.empty()) {
return absl::InvalidArgumentError(absl::StrCat("Unparseable name: ", name));
}
if (port.empty()) {
if (default_port.empty()) {
return absl::InvalidArgumentError(
absl::StrFormat("No port in name %s or default_port argument", name));
}
port = std::string(default_port);
}
// Call getaddrinfo
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC; // ipv4 or ipv6
hints.ai_socktype = SOCK_STREAM; // stream socket
hints.ai_flags = AI_PASSIVE; // for wildcard IP address
struct addrinfo* result = nullptr;
int getaddrinfo_error =
getaddrinfo(host.c_str(), port.c_str(), &hints, &result);
if (getaddrinfo_error != 0) {
return absl::UnknownError(
absl::StrFormat("Address lookup failed for %s os_error: %s", name,
grpc_core::StatusToString(
GRPC_WSA_ERROR(WSAGetLastError(), "getaddrinfo"))
.c_str()));
}
// Success path: collect and return all addresses
for (auto* resp = result; resp != nullptr; resp = resp->ai_next) {
addresses.emplace_back(resp->ai_addr, resp->ai_addrlen);
}
if (result) freeaddrinfo(result);
return addresses;
}
} // namespace
NativeWindowsDNSResolver::NativeWindowsDNSResolver(
std::shared_ptr<EventEngine> event_engine)
: event_engine_(std::move(event_engine)) {}
void NativeWindowsDNSResolver::LookupHostname(
EventEngine::DNSResolver::LookupHostnameCallback on_resolved,
absl::string_view name, absl::string_view default_port) {
event_engine_->Run(
[name, default_port, on_resolved = std::move(on_resolved)]() mutable {
on_resolved(LookupHostnameBlocking(name, default_port));
});
}
void NativeWindowsDNSResolver::LookupSRV(
EventEngine::DNSResolver::LookupSRVCallback on_resolved,
absl::string_view /* name */) {
// Not supported
event_engine_->Run([on_resolved = std::move(on_resolved)]() mutable {
on_resolved(absl::UnimplementedError(
"The Native resolver does not support looking up SRV records"));
});
}
void NativeWindowsDNSResolver::LookupTXT(
EventEngine::DNSResolver::LookupTXTCallback on_resolved,
absl::string_view /* name */) {
// Not supported
event_engine_->Run([on_resolved = std::move(on_resolved)]() mutable {
on_resolved(absl::UnimplementedError(
"The Native resolver does not support looking up TXT records"));
});
}
} // namespace experimental
} // namespace grpc_event_engine
#endif // GPR_WINDOWS
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