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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_TEST_TEST_DOH_SERVER_H_
#define NET_TEST_TEST_DOH_SERVER_H_
#include <cstdint>
#include <map>
#include <memory>
#include <string>
#include <utility>
#include "base/containers/span.h"
#include "base/strings/string_piece.h"
#include "base/synchronization/lock.h"
#include "base/thread_annotations.h"
#include "base/time/time.h"
#include "net/base/ip_address.h"
#include "net/dns/dns_response.h"
#include "net/test/embedded_test_server/embedded_test_server.h"
#include "net/test/embedded_test_server/http_response.h"
namespace net {
// TestDohServer is a test DoH server. It allows tests to specify DNS behavior
// at the level of individual DNS records.
class TestDohServer {
public:
TestDohServer();
~TestDohServer();
// Configures the hostname the DoH server serves from. If not specified, the
// server is accessed over 127.0.0.1. This determines the TLS certificate
// used, and the hostname in `GetTemplate`.
void SetHostname(base::StringPiece name);
// Configures whether the server should fail all requests with an HTTP error.
void SetFailRequests(bool fail_requests);
// Adds `address` to the set of A (or AAAA, if IPv6) responses when querying
// `name`. This is a convenience wrapper over `AddRecord`.
void AddAddressRecord(base::StringPiece name,
const IPAddress& address,
base::TimeDelta ttl = base::Days(1));
// Adds `record` to the set of records served by this server.
void AddRecord(const DnsResourceRecord& record);
// Starts the test server and returns true on success or false on failure.
//
// Note this method starts a background thread. In some tests, such as
// browser_tests, the process is required to be single-threaded in the early
// stages of test setup. Tests that call `GetTemplate` at that point should
// call `InitializeAndListen` before `GetTemplate`, followed by
// `StartAcceptingConnections` when threads are allowed. See
// `EmbeddedTestServer` for an example.
[[nodiscard]] bool Start();
// Initializes the listening socket for the test server, allocating a
// listening port, and returns true on success or false on failure. Call
// `StartAcceptingConnections` to finish initialization.
[[nodiscard]] bool InitializeAndListen();
// Spawns a background thread and begins accepting connections. This method
// must be called after `InitializeAndListen`.
void StartAcceptingConnections();
// Shuts down the server and waits until the shutdown is complete.
[[nodiscard]] bool ShutdownAndWaitUntilComplete();
// Returns the number of queries served so far.
int QueriesServed();
// Returns the URI template to connect to this server. The server's listening
// port must have been allocated with `Start` or `InitializeAndListen` before
// calling this function.
std::string GetTemplate();
// Behaves like `GetTemplate`, but returns a template without the "dns" URL
// and thus can only be used with POST.
std::string GetPostOnlyTemplate();
private:
std::unique_ptr<test_server::HttpResponse> HandleRequest(
const test_server::HttpRequest& request);
absl::optional<std::string> hostname_;
base::Lock lock_;
// The following fields are accessed from a background thread and protected by
// `lock_`.
bool fail_requests_ GUARDED_BY(lock_) = false;
// Maps from query name and query type to a record set.
std::multimap<std::pair<std::string, uint16_t>, DnsResourceRecord> records_
GUARDED_BY(lock_);
int queries_served_ GUARDED_BY(lock_) = 0;
EmbeddedTestServer server_{EmbeddedTestServer::TYPE_HTTPS};
};
} // namespace net
#endif // NET_TEST_TEST_DOH_SERVER_H_
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