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Network cleanup (#6302)
* Cleanup network headers
* Move peerhandler to a specific header to reduce compilation times
* Move socket.cpp/h to network folder
* More work
* Network code cleanups
* Move socket.{cpp,h} to network folder
* Move Address object to network/address.{cpp,h}
* Move network exceptions to network/networkexceptions.h
* Client: use unique_ptr for Connection
* Server/ClientIface: use shared_ptr for Connection
* Format fixes
* Remove socket.cpp socket.h from clang-format whitelist
* Also fix NetworkPacket code style & make it under clang-format
This commit is contained in:
Loïc Blot
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commit
c7160cb629
27 changed files with 1059 additions and 924 deletions
363
src/network/socket.cpp
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363
src/network/socket.cpp
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/*
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Minetest
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Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "socket.h"
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#include <cstdio>
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#include <iostream>
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#include <cstdlib>
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#include <cstring>
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#include <cerrno>
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#include <sstream>
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#include <iomanip>
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#include "util/string.h"
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#include "util/numeric.h"
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#include "constants.h"
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#include "debug.h"
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#include "settings.h"
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#include "log.h"
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#ifdef _WIN32
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// Without this some of the network functions are not found on mingw
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#ifndef _WIN32_WINNT
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#define _WIN32_WINNT 0x0501
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#endif
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#include <windows.h>
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#define LAST_SOCKET_ERR() WSAGetLastError()
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typedef SOCKET socket_t;
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typedef int socklen_t;
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#else
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#define LAST_SOCKET_ERR() (errno)
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typedef int socket_t;
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#endif
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// Set to true to enable verbose debug output
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bool socket_enable_debug_output = false; // yuck
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static bool g_sockets_initialized = false;
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// Initialize sockets
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void sockets_init()
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{
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#ifdef _WIN32
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// Windows needs sockets to be initialized before use
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WSADATA WsaData;
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if (WSAStartup(MAKEWORD(2, 2), &WsaData) != NO_ERROR)
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throw SocketException("WSAStartup failed");
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#endif
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g_sockets_initialized = true;
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}
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void sockets_cleanup()
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{
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#ifdef _WIN32
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// On Windows, cleanup sockets after use
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WSACleanup();
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#endif
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}
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/*
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UDPSocket
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*/
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UDPSocket::UDPSocket(bool ipv6)
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{
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init(ipv6, false);
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}
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bool UDPSocket::init(bool ipv6, bool noExceptions)
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{
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if (!g_sockets_initialized) {
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dstream << "Sockets not initialized" << std::endl;
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return false;
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}
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// Use IPv6 if specified
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m_addr_family = ipv6 ? AF_INET6 : AF_INET;
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m_handle = socket(m_addr_family, SOCK_DGRAM, IPPROTO_UDP);
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if (socket_enable_debug_output) {
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dstream << "UDPSocket(" << (int)m_handle
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<< ")::UDPSocket(): ipv6 = " << (ipv6 ? "true" : "false")
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<< std::endl;
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}
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if (m_handle <= 0) {
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if (noExceptions) {
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return false;
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}
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throw SocketException(std::string("Failed to create socket: error ") +
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itos(LAST_SOCKET_ERR()));
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}
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setTimeoutMs(0);
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return true;
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}
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UDPSocket::~UDPSocket()
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{
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if (socket_enable_debug_output) {
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dstream << "UDPSocket( " << (int)m_handle << ")::~UDPSocket()"
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<< std::endl;
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}
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#ifdef _WIN32
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closesocket(m_handle);
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#else
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close(m_handle);
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#endif
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}
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void UDPSocket::Bind(Address addr)
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{
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if (socket_enable_debug_output) {
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dstream << "UDPSocket(" << (int)m_handle
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<< ")::Bind(): " << addr.serializeString() << ":"
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<< addr.getPort() << std::endl;
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}
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if (addr.getFamily() != m_addr_family) {
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static const char *errmsg =
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"Socket and bind address families do not match";
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errorstream << "Bind failed: " << errmsg << std::endl;
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throw SocketException(errmsg);
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}
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if (m_addr_family == AF_INET6) {
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struct sockaddr_in6 address;
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memset(&address, 0, sizeof(address));
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address = addr.getAddress6();
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address.sin6_family = AF_INET6;
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address.sin6_port = htons(addr.getPort());
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if (bind(m_handle, (const struct sockaddr *)&address,
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sizeof(struct sockaddr_in6)) < 0) {
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dstream << (int)m_handle << ": Bind failed: " << strerror(errno)
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<< std::endl;
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throw SocketException("Failed to bind socket");
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}
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} else {
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struct sockaddr_in address;
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memset(&address, 0, sizeof(address));
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address = addr.getAddress();
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address.sin_family = AF_INET;
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address.sin_port = htons(addr.getPort());
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if (bind(m_handle, (const struct sockaddr *)&address,
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sizeof(struct sockaddr_in)) < 0) {
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dstream << (int)m_handle << ": Bind failed: " << strerror(errno)
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<< std::endl;
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throw SocketException("Failed to bind socket");
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}
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}
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}
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void UDPSocket::Send(const Address &destination, const void *data, int size)
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{
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bool dumping_packet = false; // for INTERNET_SIMULATOR
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if (INTERNET_SIMULATOR)
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dumping_packet = myrand() % INTERNET_SIMULATOR_PACKET_LOSS == 0;
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if (socket_enable_debug_output) {
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// Print packet destination and size
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dstream << (int)m_handle << " -> ";
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destination.print(&dstream);
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dstream << ", size=" << size;
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// Print packet contents
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dstream << ", data=";
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for (int i = 0; i < size && i < 20; i++) {
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if (i % 2 == 0)
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dstream << " ";
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unsigned int a = ((const unsigned char *)data)[i];
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dstream << std::hex << std::setw(2) << std::setfill('0') << a;
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}
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if (size > 20)
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dstream << "...";
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if (dumping_packet)
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dstream << " (DUMPED BY INTERNET_SIMULATOR)";
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dstream << std::endl;
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}
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if (dumping_packet) {
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// Lol let's forget it
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dstream << "UDPSocket::Send(): INTERNET_SIMULATOR: dumping packet."
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<< std::endl;
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return;
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}
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if (destination.getFamily() != m_addr_family)
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throw SendFailedException("Address family mismatch");
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int sent;
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if (m_addr_family == AF_INET6) {
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struct sockaddr_in6 address = destination.getAddress6();
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address.sin6_port = htons(destination.getPort());
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sent = sendto(m_handle, (const char *)data, size, 0,
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(struct sockaddr *)&address, sizeof(struct sockaddr_in6));
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} else {
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struct sockaddr_in address = destination.getAddress();
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address.sin_port = htons(destination.getPort());
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sent = sendto(m_handle, (const char *)data, size, 0,
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(struct sockaddr *)&address, sizeof(struct sockaddr_in));
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}
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if (sent != size)
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throw SendFailedException("Failed to send packet");
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}
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int UDPSocket::Receive(Address &sender, void *data, int size)
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{
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// Return on timeout
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if (!WaitData(m_timeout_ms))
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return -1;
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int received;
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if (m_addr_family == AF_INET6) {
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struct sockaddr_in6 address;
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memset(&address, 0, sizeof(address));
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socklen_t address_len = sizeof(address);
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received = recvfrom(m_handle, (char *)data, size, 0,
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(struct sockaddr *)&address, &address_len);
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if (received < 0)
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return -1;
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u16 address_port = ntohs(address.sin6_port);
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IPv6AddressBytes bytes;
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memcpy(bytes.bytes, address.sin6_addr.s6_addr, 16);
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sender = Address(&bytes, address_port);
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} else {
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struct sockaddr_in address;
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memset(&address, 0, sizeof(address));
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socklen_t address_len = sizeof(address);
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received = recvfrom(m_handle, (char *)data, size, 0,
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(struct sockaddr *)&address, &address_len);
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if (received < 0)
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return -1;
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u32 address_ip = ntohl(address.sin_addr.s_addr);
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u16 address_port = ntohs(address.sin_port);
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sender = Address(address_ip, address_port);
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}
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if (socket_enable_debug_output) {
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// Print packet sender and size
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dstream << (int)m_handle << " <- ";
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sender.print(&dstream);
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dstream << ", size=" << received;
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// Print packet contents
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dstream << ", data=";
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for (int i = 0; i < received && i < 20; i++) {
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if (i % 2 == 0)
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dstream << " ";
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unsigned int a = ((const unsigned char *)data)[i];
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dstream << std::hex << std::setw(2) << std::setfill('0') << a;
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}
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if (received > 20)
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dstream << "...";
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dstream << std::endl;
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}
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return received;
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}
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int UDPSocket::GetHandle()
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{
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return m_handle;
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}
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void UDPSocket::setTimeoutMs(int timeout_ms)
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{
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m_timeout_ms = timeout_ms;
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}
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bool UDPSocket::WaitData(int timeout_ms)
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{
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fd_set readset;
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int result;
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// Initialize the set
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FD_ZERO(&readset);
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FD_SET(m_handle, &readset);
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// Initialize time out struct
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struct timeval tv;
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tv.tv_sec = 0;
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tv.tv_usec = timeout_ms * 1000;
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// select()
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result = select(m_handle + 1, &readset, NULL, NULL, &tv);
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if (result == 0)
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return false;
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if (result < 0 && (errno == EINTR || errno == EBADF)) {
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// N.B. select() fails when sockets are destroyed on Connection's dtor
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// with EBADF. Instead of doing tricky synchronization, allow this
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// thread to exit but don't throw an exception.
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return false;
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}
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if (result < 0) {
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dstream << m_handle << ": Select failed: " << strerror(errno)
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<< std::endl;
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#ifdef _WIN32
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int e = WSAGetLastError();
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dstream << (int)m_handle << ": WSAGetLastError()=" << e << std::endl;
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if (e == 10004 /* WSAEINTR */ || e == 10009 /* WSAEBADF */) {
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infostream << "Ignoring WSAEINTR/WSAEBADF." << std::endl;
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return false;
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}
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#endif
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throw SocketException("Select failed");
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} else if (!FD_ISSET(m_handle, &readset)) {
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// No data
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return false;
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}
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// There is data
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return true;
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}
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