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// Copyright (C) 2011-2024 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
/// \brief Test of UDPSocket
///
/// Tests the functionality of a UDPSocket by working through an open-send-
/// receive-close sequence and checking that the asynchronous notifications
/// work.
#include <config.h>
#include <asiolink/asio_wrapper.h>
#include <asiolink/io_service.h>
#include <asiolink/udp_endpoint.h>
#include <asiolink/udp_socket.h>
#include <util/buffer.h>
#include <util/io.h>
#include <boost/shared_ptr.hpp>
#include <gtest/gtest.h>
#include <string>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <algorithm>
#include <cstdlib>
#include <cstddef>
#include <vector>
using namespace isc::asiolink;
using namespace isc::util;
using namespace boost::asio;
using namespace std;
namespace {
const char SERVER_ADDRESS[] = "127.0.0.1";
const unsigned short SERVER_PORT = 5301;
// TODO: Shouldn't we send something that is real message?
const char OUTBOUND_DATA[] = "Data sent from client to server";
const char INBOUND_DATA[] = "Returned data from server to client";
}
///
/// An instance of this object is passed to the asynchronous I/O functions
/// and the operator() method is called when when an asynchronous I/O
/// completes. The arguments to the completion callback are stored for later
/// retrieval.
class UDPCallback {
public:
struct PrivateData {
PrivateData() :
error_code_(), length_(0), called_(false), name_("")
{}
boost::system::error_code error_code_; ///< Completion error code
size_t length_; ///< Number of bytes transferred
bool called_; ///< Set true when callback called
std::string name_; ///< Which of the objects this is
};
/// \brief Constructor
///
/// Constructs the object. It also creates the data member pointed to by
/// a shared pointer. When used as a callback object, this is copied as it
/// is passed into the asynchronous function. This means that there are two
/// objects and inspecting the one we passed in does not tell us anything.
///
/// Therefore we use a boost::shared_ptr. When the object is copied, the
/// shared pointer is copied, which leaves both objects pointing to the same
/// data.
///
/// \param which Which of the two callback objects this is
UDPCallback(const std::string& which) : ptr_(new PrivateData())
{
setName(which);
}
/// \brief Destructor
///
/// No code needed, destroying the shared pointer destroys the private data.
virtual ~UDPCallback()
{}
/// \brief Callback Function
///
/// Called when an asynchronous I/O completes, this stores the
/// completion error code and the number of bytes transferred.
///
/// \param ec I/O completion error code passed to callback function.
/// \param length Number of bytes transferred
virtual void operator()(boost::system::error_code ec, size_t length = 0) {
ptr_->error_code_ = ec;
setLength(length);
setCalled(true);
}
/// \brief Get I/O completion error code
int getCode() {
return (ptr_->error_code_.value());
}
/// \brief Set I/O completion code
///
/// \param code New value of completion code
void setCode(int code) {
ptr_->error_code_ = boost::system::error_code(code, boost::system::error_code().category());
}
/// \brief Get number of bytes transferred in I/O
size_t getLength() const {
return (ptr_->length_);
}
/// \brief Set number of bytes transferred in I/O
///
/// \param length New value of length parameter
void setLength(size_t length) {
ptr_->length_ = length;
}
/// \brief Get flag to say when callback was called
bool getCalled() const {
return (ptr_->called_);
}
/// \brief Set flag to say when callback was called
///
/// \param called New value of called parameter
void setCalled(bool called) {
ptr_->called_ = called;
}
/// \brief Return instance of callback name
std::string getName() const {
return (ptr_->name_);
}
/// \brief Set callback name
///
/// \param name New value of the callback name
void setName(const std::string& name) {
ptr_->name_ = name;
}
private:
boost::shared_ptr<PrivateData> ptr_; ///< Pointer to private data
};
// Receive complete method should return true regardless of what is in the first
// two bytes of a buffer.
TEST(UDPSocket, processReceivedData) {
IOServicePtr service(new IOService()); // Used to instantiate socket
UDPSocket<UDPCallback> test(service); // Socket under test
uint8_t inbuff[32]; // Buffer to check
OutputBufferPtr outbuff(new OutputBuffer(16)); // Where data is put
// cppcheck-suppress variableScope
size_t expected; // Expected amount of data
// cppcheck-suppress variableScope
size_t offset; // Where to put next data
// cppcheck-suppress variableScope
size_t cumulative; // Cumulative data received
// Set some dummy values in the buffer to check
for (uint8_t i = 0; i < sizeof(inbuff); ++i) {
inbuff[i] = i;
}
// Expect that the value is true whatever number is written in the first
// two bytes of the buffer.
uint16_t count = 0;
for (uint32_t i = 0; i < (2 << 16); ++i, ++count) {
writeUint16(count, inbuff, sizeof(inbuff));
// Set some random values
cumulative = 5;
offset = 10;
expected = 15;
outbuff->clear();
bool completed = test.processReceivedData(inbuff, sizeof(inbuff),
cumulative, offset, expected,
outbuff);
EXPECT_TRUE(completed);
EXPECT_EQ(sizeof(inbuff), cumulative);
EXPECT_EQ(0, offset);
EXPECT_EQ(sizeof(inbuff), expected);
const uint8_t* dataptr = outbuff->getData();
EXPECT_TRUE(equal(inbuff, inbuff + sizeof(inbuff) - 1, dataptr));
}
}
// TODO: Need to add a test to check the cancel() method
// Tests the operation of a UDPSocket by opening it, sending an asynchronous
// message to a server, receiving an asynchronous message from the server and
// closing.
TEST(UDPSocket, SequenceTest) {
// Common objects.
IOServicePtr service(new IOService()); // Service object for async control
// Server
IOAddress server_address(SERVER_ADDRESS); // Address of target server
UDPCallback server_cb("Server"); // Server callback
UDPEndpoint server_endpoint(server_address, SERVER_PORT); // Endpoint describing server
UDPEndpoint server_remote_endpoint; // Address where server received message from
// The client - the UDPSocket being tested
UDPSocket<UDPCallback> client(service); // Socket under test
UDPCallback client_cb("Client"); // Async I/O callback function
UDPEndpoint client_remote_endpoint; // Where client receives message from
size_t client_cumulative = 0; // Cumulative data received
size_t client_offset = 0; // Offset into buffer where data is put
size_t client_expected = 0; // Expected amount of data
OutputBufferPtr client_buffer(new OutputBuffer(16)); // Where data is put
// The server - with which the client communicates. For convenience, we
// use the same io_service, and use the endpoint object created for
// the client to send to as the endpoint object in the constructor.
boost::asio::ip::udp::socket server(service->getInternalIOService(),
server_endpoint.getASIOEndpoint());
server.set_option(socket_base::reuse_address(true));
// Assertion to ensure that the server buffer is large enough
char data[UDPSocket<UDPCallback>::MIN_SIZE];
ASSERT_GT(sizeof(data), sizeof(OUTBOUND_DATA));
// Open the client socket - the operation should be synchronous
EXPECT_TRUE(client.isOpenSynchronous());
client.open(&server_endpoint, client_cb);
// Issue read on the server. Completion callback should not have run.
server_cb.setCalled(false);
server_cb.setCode(42); // Answer to Life, the Universe and Everything!
server.async_receive_from(buffer(data, sizeof(data)),
server_remote_endpoint.getASIOEndpoint(), server_cb);
EXPECT_FALSE(server_cb.getCalled());
// Write something to the server using the client - the callback should not
// be called until we call the io_service->run() method.
client_cb.setCalled(false);
client_cb.setCode(7); // Arbitrary number
client.asyncSend(OUTBOUND_DATA, sizeof(OUTBOUND_DATA), &server_endpoint, client_cb);
EXPECT_FALSE(client_cb.getCalled());
// Execute the two callbacks.
service->runOne();
service->runOne();
EXPECT_TRUE(client_cb.getCalled());
EXPECT_EQ(0, client_cb.getCode());
EXPECT_EQ(sizeof(OUTBOUND_DATA), client_cb.getLength());
EXPECT_TRUE(server_cb.getCalled());
EXPECT_EQ(0, server_cb.getCode());
EXPECT_EQ(sizeof(OUTBOUND_DATA), server_cb.getLength());
EXPECT_TRUE(equal(&data[0], &data[server_cb.getLength() - 1], OUTBOUND_DATA));
// Now return data from the server to the client. Issue the read on the
// client.
client_cb.setLength(12345); // Arbitrary number
client_cb.setCalled(false);
client_cb.setCode(32); // Arbitrary number
client.asyncReceive(data, sizeof(data), client_cumulative,
&client_remote_endpoint, client_cb);
// Issue the write on the server side to the source of the data it received.
server_cb.setLength(22345); // Arbitrary number
server_cb.setCalled(false);
server_cb.setCode(232); // Arbitrary number
server.async_send_to(buffer(INBOUND_DATA, sizeof(INBOUND_DATA)),
server_remote_endpoint.getASIOEndpoint(), server_cb);
// Expect two callbacks to run.
service->runOne();
service->runOne();
EXPECT_TRUE(client_cb.getCalled());
EXPECT_EQ(0, client_cb.getCode());
EXPECT_EQ(sizeof(INBOUND_DATA), client_cb.getLength());
EXPECT_TRUE(server_cb.getCalled());
EXPECT_EQ(0, server_cb.getCode());
EXPECT_EQ(sizeof(INBOUND_DATA), server_cb.getLength());
EXPECT_TRUE(equal(&data[0], &data[server_cb.getLength() - 1], INBOUND_DATA));
// Check that the address/port received by the client corresponds to the
// address and port the server is listening on.
EXPECT_TRUE(server_address == client_remote_endpoint.getAddress());
EXPECT_EQ(SERVER_PORT, client_remote_endpoint.getPort());
// Check that the receive received a complete buffer's worth of data.
EXPECT_TRUE(client.processReceivedData(&data[0], client_cb.getLength(),
client_cumulative, client_offset,
client_expected, client_buffer));
EXPECT_EQ(client_cb.getLength(), client_cumulative);
EXPECT_EQ(0, client_offset);
EXPECT_EQ(client_cb.getLength(), client_expected);
EXPECT_EQ(client_cb.getLength(), client_buffer->getLength());
// ...and check that the data was copied to the output client buffer.
const uint8_t* client_char_data = client_buffer->getData();
EXPECT_TRUE(equal(&data[0], &data[client_cb.getLength() - 1], client_char_data));
// Close client and server.
EXPECT_NO_THROW(client.close());
EXPECT_NO_THROW(server.close());
}
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