3 Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as published by
7 the Free Software Foundation; either version 2.1 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
29 #include "util/string.h"
30 #include "util/numeric.h"
31 #include "constants.h"
37 // Without this some of the network functions are not found on mingw
39 #define _WIN32_WINNT 0x0501
44 #define LAST_SOCKET_ERR() WSAGetLastError()
45 typedef SOCKET socket_t;
46 typedef int socklen_t;
48 #include <sys/types.h>
49 #include <sys/socket.h>
50 #include <netinet/in.h>
54 #include <arpa/inet.h>
55 #define LAST_SOCKET_ERR() (errno)
59 // Set to true to enable verbose debug output
60 bool socket_enable_debug_output = false; // yuck
62 static bool g_sockets_initialized = false;
68 // Windows needs sockets to be initialized before use
70 if(WSAStartup( MAKEWORD(2,2), &WsaData ) != NO_ERROR)
71 throw SocketException("WSAStartup failed");
73 g_sockets_initialized = true;
76 void sockets_cleanup()
79 // On Windows, cleanup sockets after use
90 memset(&m_address, 0, sizeof(m_address));
93 Address::Address(u32 address, u16 port)
95 memset(&m_address, 0, sizeof(m_address));
100 Address::Address(u8 a, u8 b, u8 c, u8 d, u16 port)
102 memset(&m_address, 0, sizeof(m_address));
103 setAddress(a, b, c, d);
107 Address::Address(const IPv6AddressBytes *ipv6_bytes, u16 port)
109 memset(&m_address, 0, sizeof(m_address));
110 setAddress(ipv6_bytes);
114 // Equality (address family, address and port must be equal)
115 bool Address::operator==(const Address &address)
117 if(address.m_addr_family != m_addr_family || address.m_port != m_port)
119 else if(m_addr_family == AF_INET)
121 return m_address.ipv4.sin_addr.s_addr ==
122 address.m_address.ipv4.sin_addr.s_addr;
124 else if(m_addr_family == AF_INET6)
126 return memcmp(m_address.ipv6.sin6_addr.s6_addr,
127 address.m_address.ipv6.sin6_addr.s6_addr, 16) == 0;
133 bool Address::operator!=(const Address &address)
135 return !(*this == address);
138 void Address::Resolve(const char *name)
140 if (!name || name[0] == 0) {
141 if (m_addr_family == AF_INET) {
143 } else if (m_addr_family == AF_INET6) {
144 setAddress((IPv6AddressBytes*) 0);
149 struct addrinfo *resolved, hints;
150 memset(&hints, 0, sizeof(hints));
153 hints.ai_socktype = 0;
154 hints.ai_protocol = 0;
156 if(g_settings->getBool("enable_ipv6"))
158 // AF_UNSPEC allows both IPv6 and IPv4 addresses to be returned
159 hints.ai_family = AF_UNSPEC;
163 hints.ai_family = AF_INET;
167 int e = getaddrinfo(name, NULL, &hints, &resolved);
169 throw ResolveError(gai_strerror(e));
172 if(resolved->ai_family == AF_INET)
174 struct sockaddr_in *t = (struct sockaddr_in *) resolved->ai_addr;
175 m_addr_family = AF_INET;
178 else if(resolved->ai_family == AF_INET6)
180 struct sockaddr_in6 *t = (struct sockaddr_in6 *) resolved->ai_addr;
181 m_addr_family = AF_INET6;
186 freeaddrinfo(resolved);
187 throw ResolveError("");
189 freeaddrinfo(resolved);
192 // IP address -> textual representation
193 std::string Address::serializeString() const
195 // windows XP doesnt have inet_ntop, maybe use better func
197 if(m_addr_family == AF_INET)
201 addr = ntohl(m_address.ipv4.sin_addr.s_addr);
202 a = (addr & 0xFF000000) >> 24;
203 b = (addr & 0x00FF0000) >> 16;
204 c = (addr & 0x0000FF00) >> 8;
205 d = (addr & 0x000000FF);
206 return itos(a) + "." + itos(b) + "." + itos(c) + "." + itos(d);
208 else if(m_addr_family == AF_INET6)
210 std::ostringstream os;
211 for(int i = 0; i < 16; i += 2)
214 (m_address.ipv6.sin6_addr.s6_addr[i] << 8) |
215 (m_address.ipv6.sin6_addr.s6_addr[i + 1]);
216 os << std::hex << section;
223 return std::string("");
225 char str[INET6_ADDRSTRLEN];
226 if (inet_ntop(m_addr_family, (m_addr_family == AF_INET) ? (void*)&(m_address.ipv4.sin_addr) : (void*)&(m_address.ipv6.sin6_addr), str, INET6_ADDRSTRLEN) == NULL) {
227 return std::string("");
229 return std::string(str);
233 struct sockaddr_in Address::getAddress() const
235 return m_address.ipv4; // NOTE: NO PORT INCLUDED, use getPort()
238 struct sockaddr_in6 Address::getAddress6() const
240 return m_address.ipv6; // NOTE: NO PORT INCLUDED, use getPort()
243 u16 Address::getPort() const
248 int Address::getFamily() const
250 return m_addr_family;
253 bool Address::isIPv6() const
255 return m_addr_family == AF_INET6;
258 bool Address::isZero() const
260 if (m_addr_family == AF_INET) {
261 return m_address.ipv4.sin_addr.s_addr == 0;
262 } else if (m_addr_family == AF_INET6) {
263 static const char zero[16] = {0};
264 return memcmp(m_address.ipv6.sin6_addr.s6_addr,
270 void Address::setAddress(u32 address)
272 m_addr_family = AF_INET;
273 m_address.ipv4.sin_family = AF_INET;
274 m_address.ipv4.sin_addr.s_addr = htonl(address);
277 void Address::setAddress(u8 a, u8 b, u8 c, u8 d)
279 m_addr_family = AF_INET;
280 m_address.ipv4.sin_family = AF_INET;
281 u32 addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
282 m_address.ipv4.sin_addr.s_addr = addr;
285 void Address::setAddress(const IPv6AddressBytes *ipv6_bytes)
287 m_addr_family = AF_INET6;
288 m_address.ipv6.sin6_family = AF_INET6;
290 memcpy(m_address.ipv6.sin6_addr.s6_addr, ipv6_bytes->bytes, 16);
292 memset(m_address.ipv6.sin6_addr.s6_addr, 0, 16);
295 void Address::setPort(u16 port)
300 void Address::print(std::ostream *s) const
302 if(m_addr_family == AF_INET6)
303 *s << "[" << serializeString() << "]:" << m_port;
305 *s << serializeString() << ":" << m_port;
312 UDPSocket::UDPSocket(bool ipv6)
317 bool UDPSocket::init(bool ipv6, bool noExceptions)
319 if (g_sockets_initialized == false) {
320 dstream << "Sockets not initialized" << std::endl;
324 // Use IPv6 if specified
325 m_addr_family = ipv6 ? AF_INET6 : AF_INET;
326 m_handle = socket(m_addr_family, SOCK_DGRAM, IPPROTO_UDP);
328 if (socket_enable_debug_output) {
329 dstream << "UDPSocket(" << (int) m_handle
330 << ")::UDPSocket(): ipv6 = "
331 << (ipv6 ? "true" : "false")
339 throw SocketException(std::string("Failed to create socket: error ")
340 + itos(LAST_SOCKET_ERR()));
350 UDPSocket::~UDPSocket()
352 if (socket_enable_debug_output) {
353 dstream << "UDPSocket( " << (int) m_handle << ")::~UDPSocket()"
358 closesocket(m_handle);
364 void UDPSocket::Bind(Address addr)
366 if(socket_enable_debug_output) {
367 dstream << "UDPSocket(" << (int) m_handle << ")::Bind(): "
368 << addr.serializeString() << ":"
369 << addr.getPort() << std::endl;
372 if (addr.getFamily() != m_addr_family) {
373 static const char *errmsg = "Socket and bind address families do not match";
374 errorstream << "Bind failed: " << errmsg << std::endl;
375 throw SocketException(errmsg);
378 if(m_addr_family == AF_INET6) {
379 struct sockaddr_in6 address;
380 memset(&address, 0, sizeof(address));
382 address = addr.getAddress6();
383 address.sin6_family = AF_INET6;
384 address.sin6_port = htons(addr.getPort());
386 if(bind(m_handle, (const struct sockaddr *) &address,
387 sizeof(struct sockaddr_in6)) < 0) {
388 dstream << (int) m_handle << ": Bind failed: "
389 << strerror(errno) << std::endl;
390 throw SocketException("Failed to bind socket");
393 struct sockaddr_in address;
394 memset(&address, 0, sizeof(address));
396 address = addr.getAddress();
397 address.sin_family = AF_INET;
398 address.sin_port = htons(addr.getPort());
400 if (bind(m_handle, (const struct sockaddr *) &address,
401 sizeof(struct sockaddr_in)) < 0) {
402 dstream << (int)m_handle << ": Bind failed: "
403 << strerror(errno) << std::endl;
404 throw SocketException("Failed to bind socket");
409 void UDPSocket::Send(const Address & destination, const void * data, int size)
411 bool dumping_packet = false; // for INTERNET_SIMULATOR
413 if(INTERNET_SIMULATOR)
414 dumping_packet = myrand() % INTERNET_SIMULATOR_PACKET_LOSS == 0;
416 if(socket_enable_debug_output) {
417 // Print packet destination and size
418 dstream << (int)m_handle << " -> ";
419 destination.print(&dstream);
420 dstream << ", size=" << size;
422 // Print packet contents
423 dstream << ", data=";
424 for(int i = 0; i < size && i < 20; i++) {
427 unsigned int a = ((const unsigned char *)data)[i];
428 dstream << std::hex << std::setw(2) << std::setfill('0') << a;
435 dstream << " (DUMPED BY INTERNET_SIMULATOR)";
437 dstream << std::endl;
441 // Lol let's forget it
442 dstream << "UDPSocket::Send(): INTERNET_SIMULATOR: dumping packet."
447 if(destination.getFamily() != m_addr_family)
448 throw SendFailedException("Address family mismatch");
451 if(m_addr_family == AF_INET6) {
452 struct sockaddr_in6 address = destination.getAddress6();
453 address.sin6_port = htons(destination.getPort());
454 sent = sendto(m_handle, (const char *)data, size,
455 0, (struct sockaddr *)&address, sizeof(struct sockaddr_in6));
457 struct sockaddr_in address = destination.getAddress();
458 address.sin_port = htons(destination.getPort());
459 sent = sendto(m_handle, (const char *)data, size,
460 0, (struct sockaddr *)&address, sizeof(struct sockaddr_in));
464 throw SendFailedException("Failed to send packet");
467 int UDPSocket::Receive(Address & sender, void *data, int size)
470 if(WaitData(m_timeout_ms) == false)
474 if (m_addr_family == AF_INET6) {
475 struct sockaddr_in6 address;
476 memset(&address, 0, sizeof(address));
477 socklen_t address_len = sizeof(address);
479 received = recvfrom(m_handle, (char *) data,
480 size, 0, (struct sockaddr *) &address, &address_len);
485 u16 address_port = ntohs(address.sin6_port);
486 IPv6AddressBytes bytes;
487 memcpy(bytes.bytes, address.sin6_addr.s6_addr, 16);
488 sender = Address(&bytes, address_port);
490 struct sockaddr_in address;
491 memset(&address, 0, sizeof(address));
493 socklen_t address_len = sizeof(address);
495 received = recvfrom(m_handle, (char *)data,
496 size, 0, (struct sockaddr *)&address, &address_len);
501 u32 address_ip = ntohl(address.sin_addr.s_addr);
502 u16 address_port = ntohs(address.sin_port);
504 sender = Address(address_ip, address_port);
507 if (socket_enable_debug_output) {
508 // Print packet sender and size
509 dstream << (int) m_handle << " <- ";
510 sender.print(&dstream);
511 dstream << ", size=" << received;
513 // Print packet contents
514 dstream << ", data=";
515 for(int i = 0; i < received && i < 20; i++) {
518 unsigned int a = ((const unsigned char *) data)[i];
519 dstream << std::hex << std::setw(2) << std::setfill('0') << a;
524 dstream << std::endl;
530 int UDPSocket::GetHandle()
535 void UDPSocket::setTimeoutMs(int timeout_ms)
537 m_timeout_ms = timeout_ms;
540 bool UDPSocket::WaitData(int timeout_ms)
545 // Initialize the set
547 FD_SET(m_handle, &readset);
549 // Initialize time out struct
552 tv.tv_usec = timeout_ms * 1000;
555 result = select(m_handle+1, &readset, NULL, NULL, &tv);
559 else if (result < 0 && (errno == EINTR || errno == EBADF)) {
560 // N.B. select() fails when sockets are destroyed on Connection's dtor
561 // with EBADF. Instead of doing tricky synchronization, allow this
562 // thread to exit but don't throw an exception.
564 } else if (result < 0) {
565 dstream << (int) m_handle << ": Select failed: "
566 << strerror(errno) << std::endl;
569 int e = WSAGetLastError();
570 dstream << (int) m_handle << ": WSAGetLastError()="
572 if (e == 10004 /* WSAEINTR */ || e == 10009 /* WSAEBADF */) {
573 infostream << "Ignoring WSAEINTR/WSAEBADF." << std::endl;
578 throw SocketException("Select failed");
579 } else if(FD_ISSET(m_handle, &readset) == false) {